Question from a user -
I want to integrate SkyChat with my existing app, however, my app requires only mobile number to login, where Skygear requires username/email password for authentication.
If I am to use mobile numbers as usernames, any advice on the following case:
If a user sells his mobile number to someone else, and the new owner uses that number to create a new account. Should the username in my system be 85299999-0, so that when the new owner create a new account, his username will be 85299999-1?