Sync users' email and phone numbers.
Some of my friends have registered using their email IDs and others have used their phone #s. Every time I add a friend, I am required to enter the correct credentials with which they have registered.
It would make a great app much better if these details could be synced automatically.
One way could be to take the user's permission and update the phone number upon installation/update.
Our system remembers the multiple email addresses and phone number a user has associated with their Splitwise account so they can be added by any of these pieces of information. However, these are still dependent on the user adding them or accepting an invite from another email address. Also be aware that they are under the control of the user so they can be removed from their account if they do not want this information there which will prevent them from being added by it.