But there are sites that explivitely ask for a "local" phone number. Maybe their automated sms system can't send to foreign numbers ? I' pretty sure that's how

But there are sites that explivitely ask for a "local" phone number. Maybe their automated sms system can't send to foreign numbers ? I' pretty sure that's how banks in the us operate Anyway in that case, the front-end should definitely catch it before the backend throws a fit