[Bossman]

There is a problem with using UM+ for out going in the US. I just tried to dial out on t-mobile and I got the same "service unavailable" And, trying to register on AT&T failed. Can't even get the balance. Have never had problems dialing out bor registering on either tmobile or AT&T. Dialing via the services menu as I posted above should work, so you should probably give it some time or if you really need to test it today, give UM customer service a call from a land line. They'll probably just tell you the thing is now working for outgoing in the US at the moment.