Yesterday my little side project Phonebooth.se went live. It’s a small but hopefully helpful REST API for developers or projects that need to validate registered users’ phone numbers. It supports both mobile and landline numbers and returns a JSON result. The service currently only supports swedish numbers but more is likely to be added going forward.
The idea is that as soon as a user fills in their number, an asynchronous request could be posted to phonebooth to check whether the number is valid or not. But feel free to use it however you please. It’s free.