I used to use Firebase + Twilio to send SMS to any devices, but I'm not sure that I can send SMS by using Firebase only or not?
Does Firebase have an API for sending SMS?
The Firebase console provides analytics-based A/B testing to help refine and improve marketing messages. After you have developed logic in your app to receive messages, you can allow non-technical users to send messages per the instructions in the Notifications page in the Firebase Help Center.
Using Twilio's REST API, you can send outgoing SMS messages from your Twilio phone number to mobile phones around the globe.
Twilio's SMS API helps you send and manage messages programmatically: To send an outbound SMS, WhatsApp, or Channels message with the API, POST to the Message resource. You'll also use the Message resource to fetch messages and list messages associated with your account.
There is no built-in API for sending SMS through Firebase. You will have to use a third-party service (such as you're currently doing with Twilio) to send SMS messages.
You can send SMS Verification using Firebase and you cannot send ordinary SMS through Firebase. You can send using Twilio instead.
Even for SMS verification, you have to wait until they release the API docs for SMS verification through Android. https://firebase.google.com/docs/auth/android/phone-auth
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