Ability to add new numbers
This is a bit of a larger issue, start with the other ones first, but this calls for the functionality to add additional local numbers. It should provide a setup page where the number, provider and any other settings may be provided, ideally including a validation component where the number is validated against the provider to confirm it's actually there. If possible, a typeahead or other UI functionality to fetch the list of numbers available in the account with the provider and prompt the user with them would be quite nice.