How to check a user's phone number without using third-party services

Question

I need to check a user's phone number who register on my app. I wanted to use 'Facebook Account Kit' to do that, but recently Facebook deprecated 'Account Kit'.

Is there a way to check a user's phone number for free without going through third party services or something like 'Facebook Account Kit'?

Answer 1

I recommend libphonenumber by Google. The Java version is optimized for running on smartphones, and is used by the Android framework since 4.0 (Ice Cream Sandwich).