Two factor code via SMS

Jones01

When adding your mobile number so you can receive a two factor code via sms the interface says nothing about having to add the country code to your number or what format that code should be in.

for example. for the UK 0044 doesn't work but adding +44 in front of the number does.

This is poor design and probably leads to many unnecessary support tickets like mine. Even better the backend should be able to route this message without needing a country code like other online services.