Using Fabric - digits for mobile number authentication

Question

I have some specific questions -

• How is digits for signup/login via mobile number?
• Is it trustworthy(I have read that twitter have used fabric as a data collecting mechanism in the past)?
• What are the prospects that it will be free forever?

Answer 1

• Yes, Digits gives your mobile app users with simple phone number
  authentication.
• Yes, it is trustworthy, Fabric is now part of Google and Google is what your know.
• Yes, it is free of cost.
  https://twittercommunity.com/t/is-digits-is-completely-free/64909