It might be a good idea to let users know where the service is available?
(I entered a UK number complete with country code and the site claimed to have sent me a verification text, but nothing has shown up after five minutes)
(I entered a UK number complete with country code and the site claimed to have sent me a verification text, but nothing has shown up after five minutes)
I use Twilio (http://twilio.com) for sending text messages, and rely on them to provide somewhat global support. UK should be supported, but their logging does show that they couldn't deliver your text message. I filed the issue with their support system, so hopefully they'll resolve this.
I will add list of countries that are supported though!