Rails register User using phone number and confirmation

问题

I am building an iPhone app and the rails backend for it. I want the user to register via their phone number and a confirmation code sent using SMS. It should work like WhatsApps authentication.

Does anyone know a gem, ideally for devise, or do I have to build this on my own?

来源：https://stackoverflow.com/questions/17771856/rails-register-user-using-phone-number-and-confirmation