clean_phone_number
will prepend 1- to any 10-digit number, in an attempt to help fix a US number that is missing the international prefix. However, there are valid 10-digit numbers that aren't US numbers, they are complete numbers including prefix for their own country.
One idea to make it better would be to not do the "1-prepend" to a number if it starts with "+" already (since that indicates a country code is included). Another option is to not do the "1-prepend" at all, and when the service provider comes back with an error, then we suggest to the user that they might need to prepend "1-" if they are entering a US number.
db/7960
Looks good! One minor issue, though. The edge of the overlay cuts out a part of submit button with long error message (see attachment).
fix in forge-classic:db/7960 (it only is needed there, and best way to tighten things up was there too)