Swift iOS环境下，无需用户装APP发送Firebase存储数据的技术咨询

Hey there! Since you're working with Swift + Firebase and want to skip building a separate backend while sending data (text/images) directly to users' phones without them needing an app, here are some solid alternatives to Twilio that fit your workflow perfectly:

Top Services to Check Out #

• Plivo
  Super similar to Twilio but with competitive pricing options. It supports both SMS and MMS (for sending images), and you can integrate it with your Firebase setup effortlessly using Firebase Cloud Functions. No custom backend needed—just write a small cloud function that triggers when you need to send data (like when user data gets updated in Firestore), pulls the phone number and relevant data from Firebase, and calls Plivo's API. They have a straightforward REST API you can call via URLSession in Swift, or use their official SDK for even less code.

• Vonage (Nexmo)
  A reliable choice with global coverage for SMS and MMS. Vonage has a dedicated Swift SDK you can use directly in your iOS app, but since you want to avoid building a backend, pairing it with Firebase Cloud Functions is ideal. You can fetch user data from Firestore or Firebase Storage (like image URLs) and pass them to Vonage's MMS API to send media straight to the user's phone. Their documentation is really clear, making integration a smooth process.

• MessageBird
  Known for its simple, developer-friendly API. MessageBird supports both SMS and MMS, and just like the others, you can hook it up to Firebase Cloud Functions. When you need to send user data, trigger a cloud function that retrieves the necessary info (phone number, text content, image links from Firebase Storage) and sends a request to MessageBird's API. No custom backend required—Firebase handles all the server-side hosting and trigger logic for you.

Key Integration Tip for Your Stack #

All these services play nicely with your Swift + Firebase setup using Firebase Cloud Functions:

1. Write a cloud function that listens for specific events (e.g., a new document added to Firestore, a manual trigger via the Firebase Console).
2. In the function, fetch the user's phone number and the data you want to send (text, image URLs from Firebase Storage).
3. Call the third-party SMS/MMS API directly from the cloud function using HTTP requests or their official SDK.

This way, you don't have to build and maintain a separate backend—Firebase takes care of all the heavy lifting on the server side.

What to Skip #

Avoid services like Firebase Cloud Messaging (FCM) here, since they require users to have your app installed to receive messages, which doesn't align with your requirement.

内容的提问来源于stack exchange，提问作者Akbar