Getting an "please enter a valid phone number" error when registering

Issue generated from Tuleap's migration script. Originally submitted by: Andoru (andoru)

A detailed description of the bug. Use following fields for description field:

* Environment:
Android Marshmallow 6.0.1

* Reproduce steps:
I've got the Ring app off Google Play, and tried to register.

* Expected result:
Registration to finish correctly, and me to be able to use the app.

* Actual result:
An error pops up saying "Please enter a valid phone number."