diff --git a/packages/backend/src/apps/twilio/actions/send-sms/index.ts b/packages/backend/src/apps/twilio/actions/send-sms/index.ts
new file mode 100644
index 00000000..6fcb55a7
--- /dev/null
+++ b/packages/backend/src/apps/twilio/actions/send-sms/index.ts
@@ -0,0 +1,64 @@
+import defineAction from '../../../../helpers/define-action';
+
+export default defineAction({
+  name: 'Send SMS',
+  key: 'sendSms',
+  description: 'Send an SMS',
+  substeps: [
+    {
+      key: 'chooseConnection',
+      name: 'Choose connection',
+    },
+    {
+      key: 'chooseAction',
+      name: 'Set up action',
+      arguments: [
+        {
+          label: 'From Number',
+          key: 'fromNumber',
+          type: 'string',
+          required: true,
+          description:
+            'The number to send the SMS from. Include country code. Example: 15551234567',
+          variables: true,
+        },
+        {
+          label: 'To Number',
+          key: 'toNumber',
+          type: 'string',
+          required: true,
+          description:
+            'The number to send the SMS to. Include country code. Example: 15551234567',
+          variables: true,
+        },
+        {
+          label: 'Message',
+          key: 'message',
+          type: 'string',
+          required: true,
+          description: 'The message to send.',
+          variables: true,
+        },
+      ],
+    },
+    {
+      key: 'testStep',
+      name: 'Test action',
+    },
+  ],
+
+  async run($) {
+    const requestPath = `/2010-04-01/Accounts/${$.auth.data.accountSid}/Messages.json`;
+    const messageBody = $.step.parameters.message;
+
+    const fromNumber = '+' + ($.step.parameters.fromNumber as string).trim();
+    const toNumber = '+' + ($.step.parameters.toNumber as string).trim();
+
+    const response = await $.http.post(
+      requestPath,
+      `Body=${messageBody}&From=${fromNumber}&To=${toNumber}`
+    );
+
+    $.setActionItem({ raw: response.data });
+  },
+});
diff --git a/packages/backend/src/apps/twilio/auth/verify-credentials.ts b/packages/backend/src/apps/twilio/auth/verify-credentials.ts
index 3cbc44d7..8d7b8d53 100644
--- a/packages/backend/src/apps/twilio/auth/verify-credentials.ts
+++ b/packages/backend/src/apps/twilio/auth/verify-credentials.ts
@@ -2,12 +2,7 @@ import { IGlobalVariable } from '@automatisch/types';
 
 const verifyCredentials = async ($: IGlobalVariable) => {
   try {
-    await $.http.get('/2010-04-01/Accounts.json?PageSize=1', {
-      auth: {
-        username: $.auth.data.accountSid as string,
-        password: $.auth.data.authToken as string,
-      },
-    });
+    await $.http.get('/2010-04-01/Accounts.json?PageSize=1');
 
     await $.auth.set({
       screenName: $.auth.data.accountSid,
diff --git a/packages/backend/src/apps/twilio/common/add-auth-header.ts b/packages/backend/src/apps/twilio/common/add-auth-header.ts
new file mode 100644
index 00000000..f5f47f85
--- /dev/null
+++ b/packages/backend/src/apps/twilio/common/add-auth-header.ts
@@ -0,0 +1,20 @@
+import { TBeforeRequest } from '@automatisch/types';
+
+const addAuthHeader: TBeforeRequest = ($, requestConfig) => {
+  if (
+    requestConfig.headers &&
+    $.auth.data?.accountSid &&
+    $.auth.data?.authToken
+  ) {
+    requestConfig.headers['Content-Type'] = 'application/x-www-form-urlencoded';
+
+    requestConfig.auth = {
+      username: $.auth.data.accountSid as string,
+      password: $.auth.data.authToken as string,
+    };
+  }
+
+  return requestConfig;
+};
+
+export default addAuthHeader;
diff --git a/packages/backend/src/apps/twilio/index.ts b/packages/backend/src/apps/twilio/index.ts
index dd312eaf..46c3f248 100644
--- a/packages/backend/src/apps/twilio/index.ts
+++ b/packages/backend/src/apps/twilio/index.ts
@@ -1,4 +1,5 @@
 import defineApp from '../../helpers/define-app';
+import addAuthHeader from './common/add-auth-header';
 
 export default defineApp({
   name: 'Twilio',
@@ -9,5 +10,5 @@ export default defineApp({
   baseUrl: 'https://twilio.com',
   apiBaseUrl: 'https://api.twilio.com',
   primaryColor: 'e1000f',
-  beforeRequest: [],
+  beforeRequest: [addAuthHeader],
 });