Is that possible to send SMS with flutter PWA app?? A Complete Guide!

In modern web development, Flutter Progressive Web Apps (PWAs) are gaining popularity for their cross-platform capabilities. Developers ask a common question: Is that possible to send SMS with flutter PWA app?? The answer is yes, but with some important considerations.

Can a Flutter PWA Send an SMS?

While Flutter PWAs are powerful, they operate within the browser environment, which limits direct access to native device features like SMS. However, there are effective workarounds:

1. Using Third-Party SMS APIs

APIs like Twilio, Nexmo (Vonage), and MessageBird allow you to send SMS through their services. Here’s how:

Steps to Integrate Twilio API in Flutter PWA:

1. Set Up a Twilio Account: Sign up on Twilio and get your API credentials.
2. Add HTTP Package: Include the http package in your pubspec.yaml: dependencies: http: ^0.13.4
3. Write the SMS Function:

Import 'package:http/http.dart' as http; import 'dart:convert'; Future<void> sendSMS(String to, String message) async { final accountSid = 'YOUR_TWILIO_ACCOUNT_SID'; final authToken = 'YOUR_TWILIO_AUTH_TOKEN'; final from = 'YOUR_TWILIO_PHONE_NUMBER'; final response = await http.post( Uri.parse('https://api.twilio.com/2010-04-01/Accounts/$accountSid/Messages.json'), headers: { 'Authorization': 'Basic ' + base64Encode(utf8.encode('$accountSid:$authToken')), }, body: { 'From': from, 'To': to, 'Body': message, }, ); if (response.statusCode == 201) { print('SMS sent successfully!'); } else { print('Failed to send SMS: ${response.body}'); } }

1. Deploy and Test: Deploy your PWA and test the SMS functionality.

2. Deep Linking with SMS Protocol

For basic SMS functionality, you can use sms: links, which trigger the default SMS app on a device:

import 'dart:html' as html;

void sendSMS(String phoneNumber, String message) {
  final smsUri = 'sms:$phoneNumber?body=${Uri.encodeComponent(message)}';
  html.window.open(smsUri, '_self');
}

Note: This method opens the SMS app with the message pre-filled but doesn’t send the SMS automatically.

Conclusion:

While Flutter PWAs can’t send SMS directly like native apps, integrating third-party APIs or using deep linking makes it possible. This approach enhances your app’s functionality and improves user experience. Combining PWAs with SMS marketing can be a game-changer for businesses looking to expand their reach.

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