I want to integrate mobile number verification in my Android application by sending an SMS from the user's mobile, so is there any API which allows verification of a mobile number by sending an SMS, apart from sending an SMS to a user's mobile?
i recommend cognalys for android
the demo app is available on play store
and its source code on github
this will be helpful to verify mobile number internationally
Because its a new way of verifying mobile number without fee . SMS method is a traditional method.
You should definitely go for Digits Api provided by fabric platform, Below is the link for the documentation.It is free of cost and also very authentic.
https://docs.fabric.io/android/digits/sign-in-with-phone-number.html
来源：https://stackoverflow.com/questions/20370980/mobile-number-verification-android