diff --git a/background.js b/background.js
index 0ecbd43..b566f8d 100644
--- a/background.js
+++ b/background.js
@@ -21,6 +21,7 @@ importScripts(
   'gopay-utils.js',
   'phone-sms/providers/hero-sms.js',
   'phone-sms/providers/five-sim.js',
+  'phone-sms/providers/nexsms.js',
   'phone-sms/providers/madao.js',
   'phone-sms/providers/registry.js',
   'background/phone-verification-flow.js',
diff --git a/background/phone-verification-flow.js b/background/phone-verification-flow.js
index c67fc45..de0923c 100644
--- a/background/phone-verification-flow.js
+++ b/background/phone-verification-flow.js
@@ -6963,8 +6963,8 @@
         );
       };
 
-      const rotateCurrentActivation = async (reason = '', releaseAction = 'cancel') => {
-        const normalizedActivation = normalizeActivation(activation);
+      const rotateCurrentActivation = async (activationCandidate, reason = '', releaseAction = 'cancel') => {
+        const normalizedActivation = normalizeActivation(activationCandidate);
         if (!normalizedActivation || getActivationProviderId(normalizedActivation, state) !== PHONE_SMS_PROVIDER_MADAO) {
           return { handled: false, nextActivation: null };
         }
@@ -6984,9 +6984,6 @@
         if (!nextActivation) {
           return { handled: true, nextActivation: null };
         }
-        activation = nextActivation;
-        shouldCancelActivation = true;
-        await persistCurrentActivation(nextActivation);
         await addLog(
           `步骤 9：MaDao 已通过路由替换切换到新号码 ${nextActivation.phoneNumber}。`,
           'info'
@@ -7004,13 +7001,19 @@
           `步骤 9：添加手机号失败后正在更换号码（${formatStep9Reason(failureReason)}，${usedNumberReplacementAttempts}/${maxNumberReplacementAttempts}）。`,
           'warn'
         );
-        const rotated = shouldCancelActivation && activation
+        const failedActivation = activation;
+        const rotated = shouldCancelActivation && failedActivation
           ? await rotateCurrentActivation(
+            failedActivation,
             failureCode || failureReason,
             getPhoneReplacementReleaseAction(failureCode || failureReason)
           )
           : { handled: false, nextActivation: null };
         if (rotated.nextActivation) {
+          activation = normalizeActivation(rotated.nextActivation);
+          shouldCancelActivation = true;
+          await clearCurrentActivation();
+          await persistCurrentActivation(activation);
           preferReuseExistingActivationOnAddPhone = false;
           addPhoneReentryWithSameActivation = 0;
           pageState = {
@@ -7126,9 +7129,14 @@
                   );
                 }
                 const rotated = shouldCancelActivation && activation
-                  ? await rotateCurrentActivation('returned_to_add_phone_loop', 'cancel')
+                  ? await rotateCurrentActivation(activation, 'returned_to_add_phone_loop', 'cancel')
                   : { handled: false, nextActivation: null };
-                if (!rotated.nextActivation) {
+                if (rotated.nextActivation) {
+                  activation = normalizeActivation(rotated.nextActivation);
+                  shouldCancelActivation = true;
+                  await clearCurrentActivation();
+                  await persistCurrentActivation(activation);
+                } else {
                   if (!rotated.handled && shouldCancelActivation && activation) {
                     await cancelPhoneActivation(state, activation);
                   }
@@ -7191,9 +7199,14 @@
                   );
                 }
                 const rotated = shouldCancelActivation && activation
-                  ? await rotateCurrentActivation('phone_number_used', 'ban')
+                  ? await rotateCurrentActivation(activation, 'phone_number_used', 'ban')
                   : { handled: false, nextActivation: null };
-                if (!rotated.nextActivation) {
+                if (rotated.nextActivation) {
+                  activation = normalizeActivation(rotated.nextActivation);
+                  shouldCancelActivation = true;
+                  await clearCurrentActivation();
+                  await persistCurrentActivation(activation);
+                } else {
                   if (!rotated.handled && shouldCancelActivation && activation) {
                     await banPhoneActivation(state, activation);
                   }
@@ -7282,6 +7295,8 @@
 
           let shouldReplaceNumber = false;
           let replaceReason = '';
+          let failedActivationForReplacement = null;
+          let replacementPreparedInAdvance = false;
 
           for (let attempt = 1; attempt <= DEFAULT_PHONE_SUBMIT_ATTEMPTS; attempt += 1) {
             throwIfStopped();
@@ -7291,6 +7306,7 @@
               await markPreferredActivationExhausted(codeResult.reason || 'sms_timeout');
               shouldReplaceNumber = true;
               replaceReason = codeResult.reason || 'sms_not_received';
+              failedActivationForReplacement = activation;
               break;
             }
 
@@ -7326,6 +7342,7 @@
               if (isPhoneNumberUsedError(invalidErrorText)) {
                 shouldReplaceNumber = true;
                 replaceReason = 'phone_number_used';
+                failedActivationForReplacement = activation;
                 await discardPhoneActivationFromReuse(
                   `目标站拒绝该号码（${invalidErrorText}）。`,
                   activation,
@@ -7336,13 +7353,19 @@
                     `自动白嫖复用号码 ${activation.phoneNumber} 被目标站拒绝。`
                   );
                 }
-                if (
-                  shouldCancelActivation
-                  && activation
-                  && getActivationProviderId(activation, state) !== PHONE_SMS_PROVIDER_MADAO
-                ) {
-                  await banPhoneActivation(state, activation);
-                  shouldCancelActivation = false;
+                if (shouldCancelActivation && activation) {
+                  const rotated = await rotateCurrentActivation(activation, 'phone_number_used', 'ban');
+                  if (rotated.nextActivation) {
+                    activation = normalizeActivation(rotated.nextActivation);
+                    shouldCancelActivation = true;
+                    replacementPreparedInAdvance = true;
+                  } else if (rotated.handled) {
+                    activation = null;
+                    shouldCancelActivation = false;
+                  } else {
+                    await banPhoneActivation(state, activation);
+                    shouldCancelActivation = false;
+                  }
                 }
                 await addLog(
                   `步骤 9：手机号被提示已使用（${invalidErrorText}），立即更换新号码。`,
@@ -7354,13 +7377,20 @@
               if (attempt >= DEFAULT_PHONE_SUBMIT_ATTEMPTS) {
                 shouldReplaceNumber = true;
                 replaceReason = 'code_rejected';
-                if (
-                  shouldCancelActivation
-                  && activation
-                  && getActivationProviderId(activation, state) !== PHONE_SMS_PROVIDER_MADAO
-                ) {
-                  await banPhoneActivation(state, activation);
-                  shouldCancelActivation = false;
+                failedActivationForReplacement = activation;
+                if (shouldCancelActivation && activation) {
+                  const rotated = await rotateCurrentActivation(activation, 'code_rejected', 'ban');
+                  if (rotated.nextActivation) {
+                    activation = normalizeActivation(rotated.nextActivation);
+                    shouldCancelActivation = true;
+                    replacementPreparedInAdvance = true;
+                  } else if (rotated.handled) {
+                    activation = null;
+                    shouldCancelActivation = false;
+                  } else {
+                    await banPhoneActivation(state, activation);
+                    shouldCancelActivation = false;
+                  }
                 }
                 await addLog(
                   `步骤 9：手机验证码连续 ${DEFAULT_PHONE_SUBMIT_ATTEMPTS} 次被拒（${invalidErrorText}），将更换号码。`,
@@ -7466,33 +7496,47 @@
             throw buildPhoneReplacementLimitError(maxNumberReplacementAttempts, replaceReason || 'unknown');
           }
 
-          const rotated = shouldCancelActivation && activation
-            ? await rotateCurrentActivation(
-              replaceReason || 'replace_number',
-              getPhoneReplacementReleaseAction(replaceReason || 'replace_number')
-            )
-            : { handled: false, nextActivation: null };
-          if (shouldRetireFreeReusableActivationOnFailure(await getState(), activation)) {
+          const failedActivation = failedActivationForReplacement || activation;
+          const rotated = replacementPreparedInAdvance
+            ? { handled: true, nextActivation: activation }
+            : (
+              shouldCancelActivation && failedActivation
+                ? await rotateCurrentActivation(
+                  failedActivation,
+                  replaceReason || 'replace_number',
+                  getPhoneReplacementReleaseAction(replaceReason || 'replace_number')
+                )
+                : { handled: false, nextActivation: null }
+            );
+          if (shouldRetireFreeReusableActivationOnFailure(await getState(), failedActivation)) {
             await retireFreeReusableActivation(
-              `自动白嫖复用号码 ${activation.phoneNumber} 在失败后被更换。`
+              `自动白嫖复用号码 ${failedActivation.phoneNumber} 在失败后被更换。`
             );
           }
-          if (isPhoneNumberUsedFailureReason(replaceReason)) {
+          if (isPhoneNumberUsedFailureReason(replaceReason) && failedActivation) {
             await discardPhoneActivationFromReuse(
               `目标站拒绝该号码（${replaceReason}）。`,
-              activation,
+              failedActivation,
               await getState()
             );
           }
-          if (!rotated.nextActivation) {
-            if (!rotated.handled && shouldCancelActivation && activation) {
-              await cancelPhoneActivation(state, activation);
+          await clearCurrentActivation();
+          if (rotated.nextActivation) {
+            activation = normalizeActivation(rotated.nextActivation);
+            shouldCancelActivation = Boolean(activation);
+            if (activation) {
+              await persistCurrentActivation(activation);
+            }
+          } else {
+            if (!rotated.handled && shouldCancelActivation && failedActivation) {
+              await cancelPhoneActivation(state, failedActivation);
             }
-            await clearCurrentActivation();
             activation = null;
             shouldCancelActivation = false;
           }
           addPhoneReentryWithSameActivation = 0;
+          failedActivationForReplacement = null;
+          replacementPreparedInAdvance = false;
 
           let returnResult = null;
           try {
diff --git a/phone-sms/providers/nexsms.js b/phone-sms/providers/nexsms.js
new file mode 100644
index 0000000..d3a189a
--- /dev/null
+++ b/phone-sms/providers/nexsms.js
@@ -0,0 +1,265 @@
+// phone-sms/providers/nexsms.js - NexSMS provider registry adapter
+(function attachNexSmsProvider(root, factory) {
+  root.PhoneSmsNexSmsProvider = factory();
+})(typeof self !== 'undefined' ? self : globalThis, function createNexSmsProviderModule() {
+  const PROVIDER_ID = 'nexsms';
+  const DEFAULT_BASE_URL = 'https://api.nexsms.net';
+  const DEFAULT_SERVICE_CODE = 'ot';
+  const DEFAULT_SERVICE_LABEL = 'OpenAI';
+  const DEFAULT_COUNTRY_ID = 1;
+  const DEFAULT_COUNTRY_LABEL = 'Country #1';
+  const DEFAULT_REQUEST_TIMEOUT_MS = 20000;
+
+  function normalizeBaseUrl(value = '') {
+    const trimmed = String(value || '').trim() || DEFAULT_BASE_URL;
+    try {
+      return new URL(trimmed).toString().replace(/\/+$/, '');
+    } catch {
+      return DEFAULT_BASE_URL;
+    }
+  }
+
+  function normalizeText(value = '', fallback = '') {
+    return String(value || '').trim() || fallback;
+  }
+
+  function normalizeNexSmsCountryId(value, fallback = DEFAULT_COUNTRY_ID) {
+    const parsed = Math.floor(Number(value));
+    if (Number.isFinite(parsed) && parsed >= 0) {
+      return parsed;
+    }
+    const fallbackParsed = Math.floor(Number(fallback));
+    if (Number.isFinite(fallbackParsed) && fallbackParsed >= 0) {
+      return fallbackParsed;
+    }
+    return DEFAULT_COUNTRY_ID;
+  }
+
+  function normalizeNexSmsCountryLabel(value = '', fallback = DEFAULT_COUNTRY_LABEL) {
+    return normalizeText(value, fallback);
+  }
+
+  function normalizeNexSmsServiceCode(value = '', fallback = DEFAULT_SERVICE_CODE) {
+    const normalized = String(value || '').trim().toLowerCase().replace(/[^a-z0-9_-]+/g, '');
+    if (normalized) {
+      return normalized;
+    }
+    const fallbackNormalized = String(fallback || '').trim().toLowerCase().replace(/[^a-z0-9_-]+/g, '');
+    return fallbackNormalized || DEFAULT_SERVICE_CODE;
+  }
+
+  function normalizeNexSmsCountryOrder(value = []) {
+    const source = Array.isArray(value)
+      ? value
+      : String(value || '')
+        .split(/[\r\n,，;；]+/)
+        .map((entry) => String(entry || '').trim())
+        .filter(Boolean);
+    const normalized = [];
+    const seen = new Set();
+
+    source.forEach((entry) => {
+      let id = -1;
+      let label = '';
+      if (entry && typeof entry === 'object' && !Array.isArray(entry)) {
+        id = normalizeNexSmsCountryId(entry.id ?? entry.countryId, -1);
+        label = normalizeText(entry.label ?? entry.countryLabel, '');
+      } else {
+        const text = String(entry || '').trim();
+        const structured = text.match(/^(\d+)\s*(?:[:|/-]\s*(.+))?$/);
+        id = normalizeNexSmsCountryId(structured?.[1] || text, -1);
+        label = normalizeText(structured?.[2], '');
+      }
+      if (id < 0 || seen.has(id)) {
+        return;
+      }
+      seen.add(id);
+      normalized.push({
+        id,
+        label: label || `Country #${id}`,
+      });
+    });
+
+    return normalized.slice(0, 20);
+  }
+
+  function resolveCountryCandidates(state = {}) {
+    const candidates = normalizeNexSmsCountryOrder(state?.nexSmsCountryOrder);
+    if (candidates.length) {
+      return candidates;
+    }
+    return [{
+      id: normalizeNexSmsCountryId(state?.nexSmsCountryId, DEFAULT_COUNTRY_ID),
+      label: normalizeNexSmsCountryLabel(state?.nexSmsCountryLabel, DEFAULT_COUNTRY_LABEL),
+    }];
+  }
+
+  function parsePayload(text) {
+    const trimmed = String(text || '').trim();
+    if (!trimmed) {
+      return '';
+    }
+    try {
+      return JSON.parse(trimmed);
+    } catch {
+      return trimmed;
+    }
+  }
+
+  function describePayload(raw) {
+    if (typeof raw === 'string') {
+      return raw.trim();
+    }
+    if (raw && typeof raw === 'object') {
+      const message = normalizeText(raw.message || raw.error || raw.msg || raw.statusText, '');
+      if (message) {
+        return message;
+      }
+      try {
+        return JSON.stringify(raw);
+      } catch {
+        return String(raw);
+      }
+    }
+    return String(raw || '').trim();
+  }
+
+  function isSuccessPayload(payload) {
+    return Boolean(payload && typeof payload === 'object' && !Array.isArray(payload) && Number(payload.code) === 0);
+  }
+
+  function resolveConfig(state = {}, deps = {}) {
+    return {
+      apiKey: normalizeText(state?.nexSmsApiKey),
+      baseUrl: normalizeBaseUrl(state?.nexSmsBaseUrl || DEFAULT_BASE_URL),
+      serviceCode: normalizeNexSmsServiceCode(state?.nexSmsServiceCode, DEFAULT_SERVICE_CODE),
+      fetchImpl: deps.fetchImpl || (typeof fetch === 'function' ? fetch.bind(globalThis) : null),
+      requestTimeoutMs: deps.requestTimeoutMs || DEFAULT_REQUEST_TIMEOUT_MS,
+    };
+  }
+
+  async function fetchPayload(config, path, actionLabel, options = {}) {
+    if (!config.fetchImpl) {
+      throw new Error('NexSMS 网络请求实现不可用。');
+    }
+    if (!config.apiKey) {
+      throw new Error('NexSMS API Key 缺失，请先在侧边栏保存接码 API Key。');
+    }
+    const controller = typeof AbortController === 'function' ? new AbortController() : null;
+    const timeoutId = controller
+      ? setTimeout(() => controller.abort(), Number(config.requestTimeoutMs) || DEFAULT_REQUEST_TIMEOUT_MS)
+      : null;
+
+    try {
+      const method = String(options.method || 'GET').trim().toUpperCase() || 'GET';
+      const requestUrl = new URL(path.replace(/^\/+/, ''), `${config.baseUrl.replace(/\/+$/, '')}/`);
+      requestUrl.searchParams.set('apiKey', config.apiKey);
+      Object.entries(options.query || {}).forEach(([key, value]) => {
+        if (value === undefined || value === null || value === '') {
+          return;
+        }
+        requestUrl.searchParams.set(key, String(value));
+      });
+      const headers = {
+        Accept: 'application/json',
+        ...(options.headers && typeof options.headers === 'object' ? options.headers : {}),
+      };
+      const requestInit = {
+        method,
+        headers,
+        signal: controller?.signal,
+      };
+      if (method !== 'GET' && method !== 'HEAD' && options.body !== undefined) {
+        requestInit.body = typeof options.body === 'string'
+          ? options.body
+          : JSON.stringify(options.body);
+        if (!requestInit.headers['Content-Type']) {
+          requestInit.headers['Content-Type'] = 'application/json';
+        }
+      }
+      const response = await config.fetchImpl(requestUrl.toString(), requestInit);
+      const text = await response.text();
+      const payload = parsePayload(text);
+      if (!response.ok) {
+        const error = new Error(`${actionLabel}失败：${describePayload(payload) || response.status}`);
+        error.payload = payload;
+        error.status = response.status;
+        throw error;
+      }
+      return payload;
+    } catch (error) {
+      if (error?.name === 'AbortError') {
+        throw new Error(`${actionLabel}超时。`);
+      }
+      throw error;
+    } finally {
+      if (timeoutId) {
+        clearTimeout(timeoutId);
+      }
+    }
+  }
+
+  async function fetchBalance(state = {}, deps = {}) {
+    const config = resolveConfig(state, deps);
+    const payload = await fetchPayload(config, '/api/user/getBalance', 'NexSMS get balance');
+    if (!isSuccessPayload(payload)) {
+      throw new Error(`NexSMS get balance 失败：${describePayload(payload) || 'empty response'}`);
+    }
+    const balance = Number(payload?.data?.balance);
+    return {
+      balance: Number.isFinite(balance) ? balance : null,
+      raw: payload,
+    };
+  }
+
+  async function fetchPrices(state = {}, countryConfig = {}, deps = {}) {
+    const config = resolveConfig(state, deps);
+    const countryId = normalizeNexSmsCountryId(countryConfig?.id, DEFAULT_COUNTRY_ID);
+    return fetchPayload(config, '/api/getCountryByService', 'NexSMS getCountryByService', {
+      query: {
+        serviceCode: config.serviceCode,
+        countryId,
+      },
+    });
+  }
+
+  function createProvider(deps = {}) {
+    const providerDeps = {
+      fetchImpl: deps.fetchImpl,
+      requestTimeoutMs: deps.requestTimeoutMs || DEFAULT_REQUEST_TIMEOUT_MS,
+    };
+    return {
+      id: PROVIDER_ID,
+      label: 'NexSMS',
+      defaultCountryId: DEFAULT_COUNTRY_ID,
+      defaultCountryLabel: DEFAULT_COUNTRY_LABEL,
+      defaultProduct: DEFAULT_SERVICE_LABEL,
+      defaultServiceCode: DEFAULT_SERVICE_CODE,
+      normalizeCountryId: normalizeNexSmsCountryId,
+      normalizeCountryLabel: normalizeNexSmsCountryLabel,
+      normalizeCountryOrder: normalizeNexSmsCountryOrder,
+      normalizeServiceCode: normalizeNexSmsServiceCode,
+      resolveCountryCandidates,
+      fetchBalance: (state) => fetchBalance(state, providerDeps),
+      fetchPrices: (state, countryConfig) => fetchPrices(state, countryConfig, providerDeps),
+      describePayload,
+      isSuccessPayload,
+    };
+  }
+
+  return {
+    PROVIDER_ID,
+    DEFAULT_BASE_URL,
+    DEFAULT_COUNTRY_ID,
+    DEFAULT_COUNTRY_LABEL,
+    DEFAULT_SERVICE_CODE,
+    DEFAULT_SERVICE_LABEL,
+    createProvider,
+    describePayload,
+    isSuccessPayload,
+    normalizeNexSmsCountryId,
+    normalizeNexSmsCountryLabel,
+    normalizeNexSmsCountryOrder,
+    normalizeNexSmsServiceCode,
+  };
+});
diff --git a/sidepanel/sidepanel.html b/sidepanel/sidepanel.html
index 19809da..13855ad 100644
--- a/sidepanel/sidepanel.html
+++ b/sidepanel/sidepanel.html
@@ -1896,6 +1896,7 @@
   <script src="../gopay-utils.js"></script>
   <script src="../phone-sms/providers/hero-sms.js"></script>
   <script src="../phone-sms/providers/five-sim.js"></script>
+  <script src="../phone-sms/providers/nexsms.js"></script>
   <script src="../phone-sms/providers/madao.js"></script>
   <script src="../phone-sms/providers/registry.js"></script>
   <script src="../icloud-utils.js"></script>
diff --git a/tests/phone-sms-provider-registry.test.js b/tests/phone-sms-provider-registry.test.js
index 9b4d61a..18666b0 100644
--- a/tests/phone-sms-provider-registry.test.js
+++ b/tests/phone-sms-provider-registry.test.js
@@ -3,6 +3,7 @@ const assert = require('node:assert/strict');
 const fs = require('node:fs');
 
 const source = fs.readFileSync('phone-sms/providers/registry.js', 'utf8');
+const nexSmsSource = fs.readFileSync('phone-sms/providers/nexsms.js', 'utf8');
 
 function loadRegistry(root = {}) {
   return new Function('self', `${source}; return self.PhoneSmsProviderRegistry;`)(root);
@@ -16,6 +17,9 @@ test('phone sms provider registry normalizes ids, order and labels consistently'
     PhoneSmsFiveSimProvider: {
       createProvider: (deps = {}) => ({ provider: '5sim', deps }),
     },
+    PhoneSmsNexSmsProvider: {
+      createProvider: (deps = {}) => ({ provider: 'nexsms', deps }),
+    },
     PhoneSmsMaDaoProvider: {
       createProvider: (deps = {}) => ({ provider: 'madao', deps }),
     },
@@ -52,5 +56,29 @@ test('phone sms provider registry normalizes ids, order and labels consistently'
     registry.createProvider('madao', { foo: 2 }),
     { provider: 'madao', deps: { foo: 2 } }
   );
-  assert.throws(() => registry.createProvider('nexsms'), /接码平台模块未加载：nexsms/);
+  assert.deepStrictEqual(
+    registry.createProvider('nexsms', { foo: 3 }),
+    { provider: 'nexsms', deps: { foo: 3 } }
+  );
+});
+
+test('phone sms provider registry creates the real NexSMS provider module', () => {
+  const root = {};
+  const nexSmsModule = new Function('self', `${nexSmsSource}; return self.PhoneSmsNexSmsProvider;`)(root);
+  const registry = loadRegistry({
+    PhoneSmsNexSmsProvider: nexSmsModule,
+  });
+
+  const provider = registry.createProvider('nexsms', { fetchImpl: async () => ({ ok: true, text: async () => '{}' }) });
+
+  assert.equal(provider.id, 'nexsms');
+  assert.equal(provider.label, 'NexSMS');
+  assert.equal(provider.defaultServiceCode, 'ot');
+  assert.deepStrictEqual(
+    provider.normalizeCountryOrder(['1:Thailand', { id: 2, label: 'United States' }, '1:Duplicate']),
+    [
+      { id: 1, label: 'Thailand' },
+      { id: 2, label: 'United States' },
+    ]
+  );
 });
diff --git a/tests/phone-verification-flow.test.js b/tests/phone-verification-flow.test.js
index 4682467..f2e6852 100644
--- a/tests/phone-verification-flow.test.js
+++ b/tests/phone-verification-flow.test.js
@@ -8955,6 +8955,148 @@ test('phone verification helper uses MaDao routing replace when add-phone reject
   assert.equal(currentState.currentPhoneActivation, null);
 });
 
+test('phone verification helper keeps failed MaDao activation separate after routing replace on invalid code', async () => {
+  const requests = [];
+  const submittedPhones = [];
+  const removedReusePhones = [];
+  let verificationSubmitCount = 0;
+  let currentState = {
+    phoneSmsProvider: 'madao',
+    madaoBaseUrl: 'http://127.0.0.1:7822',
+    madaoMode: 'routing_plan',
+    madaoRoutingPlanId: 'rp-openai',
+    verificationResendCount: 0,
+    phoneVerificationReplacementLimit: 2,
+    phoneCodeWaitSeconds: 15,
+    phoneCodeTimeoutWindows: 1,
+    phoneCodePollIntervalSeconds: 1,
+    phoneCodePollMaxRounds: 1,
+    currentPhoneActivation: null,
+    reusablePhoneActivation: null,
+  };
+  const helpers = api.createPhoneVerificationHelpers({
+    addLog: async () => {},
+    createMaDaoProvider: maDaoModule.createProvider,
+    ensureStep8SignupPageReady: async () => {},
+    fetchImpl: async (url, options = {}) => {
+      const parsedUrl = new URL(url);
+      requests.push({ url: parsedUrl, body: options.body ? JSON.parse(options.body) : null });
+      if (parsedUrl.pathname === '/api/acquire') {
+        return {
+          ok: true,
+          status: 200,
+          text: async () => JSON.stringify({
+            ticket_id: 'madao-old',
+            phone_number: '+441111111111',
+            service: 'openai',
+            country: 'GB',
+            routing_plan_id: 'rp-openai',
+            routing_item_id: 'route-old',
+            status: 'waiting_code',
+          }),
+        };
+      }
+      if (parsedUrl.pathname === '/api/routing/replace') {
+        return {
+          ok: true,
+          status: 200,
+          text: async () => JSON.stringify({
+            current_ticket_id: 'madao-old',
+            current_ticket_release: { ticket_id: 'madao-old', status: 'banned' },
+            next_ticket: {
+              ticket_id: 'madao-new',
+              phone_number: '+442222222222',
+              service: 'openai',
+              country: 'GB',
+              routing_plan_id: 'rp-openai',
+              routing_item_id: 'route-new',
+              status: 'waiting_code',
+            },
+          }),
+        };
+      }
+      if (parsedUrl.pathname === '/api/poll') {
+        return {
+          ok: true,
+          status: 200,
+          text: async () => JSON.stringify({
+            ticket_id: parsedUrl.pathname,
+            status: 'code_received',
+            code: requests.filter((entry) => entry.url.pathname === '/api/poll').length === 1 ? '111111' : '222222',
+          }),
+        };
+      }
+      if (parsedUrl.pathname === '/api/release') {
+        return {
+          ok: true,
+          status: 200,
+          text: async () => JSON.stringify({ ok: true }),
+        };
+      }
+      throw new Error(`Unexpected MaDao path: ${parsedUrl.pathname}`);
+    },
+    getOAuthFlowStepTimeoutMs: async (defaultTimeoutMs) => defaultTimeoutMs,
+    getState: async () => ({ ...currentState }),
+    sendToContentScriptResilient: async (_source, message) => {
+      if (message.type === 'SUBMIT_PHONE_NUMBER') {
+        submittedPhones.push(message.payload.phoneNumber);
+        return { phoneVerificationPage: true, url: 'https://auth.openai.com/phone-verification' };
+      }
+      if (message.type === 'SUBMIT_PHONE_VERIFICATION_CODE') {
+        verificationSubmitCount += 1;
+        if (verificationSubmitCount === 1) {
+          return {
+            invalidCode: true,
+            errorText: 'This phone number is already linked to another account',
+            phoneVerificationPage: true,
+            url: 'https://auth.openai.com/phone-verification',
+          };
+        }
+        assert.equal(message.payload.code, '222222');
+        return { success: true, consentReady: true, url: 'https://auth.openai.com/authorize' };
+      }
+      if (message.type === 'RETURN_TO_ADD_PHONE' || message.type === 'STEP8_GET_STATE') {
+        return { addPhonePage: true, phoneVerificationPage: false, url: 'https://auth.openai.com/add-phone' };
+      }
+      throw new Error(`Unexpected content-script message: ${message.type}`);
+    },
+    setState: async (updates) => {
+      if (Array.isArray(updates.reusablePhoneActivationPool)) {
+        updates.reusablePhoneActivationPool.forEach((entry) => removedReusePhones.push(entry.phoneNumber));
+      }
+      currentState = { ...currentState, ...updates };
+    },
+    sleepWithStop: async () => {},
+    throwIfStopped: () => {},
+  });
+
+  const result = await helpers.completePhoneVerificationFlow(1, {
+    addPhonePage: true,
+    phoneVerificationPage: false,
+    url: 'https://auth.openai.com/add-phone',
+  });
+
+  assert.deepStrictEqual(result, {
+    success: true,
+    consentReady: true,
+    url: 'https://auth.openai.com/authorize',
+  });
+  assert.deepStrictEqual(submittedPhones, ['+441111111111', '+442222222222']);
+  assert.deepStrictEqual(
+    requests.map((entry) => entry.url.pathname),
+    ['/api/acquire', '/api/poll', '/api/routing/replace', '/api/poll', '/api/release']
+  );
+  assert.deepStrictEqual(requests[2].body, {
+    ticket_id: 'madao-old',
+    release_action: 'ban',
+    failed_item_id: 'route-old',
+    reason: 'phone_number_used',
+  });
+  assert.deepStrictEqual(requests[4].body, { ticket_id: 'madao-new', action: 'finish' });
+  assert.equal(currentState.currentPhoneActivation, null);
+  assert.equal(removedReusePhones.includes('+442222222222'), false);
+});
+
 test('phone verification helper reacquires MaDao direct numbers after releasing rejected number', async () => {
   const requests = [];
   const submittedPhones = [];
diff --git a/tests/sidepanel-phone-verification-settings.test.js b/tests/sidepanel-phone-verification-settings.test.js
index 814e0d4..a042622 100644
--- a/tests/sidepanel-phone-verification-settings.test.js
+++ b/tests/sidepanel-phone-verification-settings.test.js
@@ -88,6 +88,7 @@ test('sidepanel html exposes phone verification toggle and multi-provider SMS ro
   assert.match(html, /id="select-phone-sms-provider"/);
   assert.match(html, /\.\.\/phone-sms\/providers\/hero-sms\.js/);
   assert.match(html, /\.\.\/phone-sms\/providers\/five-sim\.js/);
+  assert.match(html, /\.\.\/phone-sms\/providers\/nexsms\.js/);
   assert.match(html, /\.\.\/phone-sms\/providers\/madao\.js/);
   assert.match(html, /\.\.\/phone-sms\/providers\/registry\.js/);
   assert.match(html, /<option value="hero-sms">HeroSMS<\/option>/);