Yeah, when you call T-Mobile, don't talk to the CS reps, ask for the tech dept. Sound like they didn't pair your digits right. You definitely should be able to make snd receive calls away from your phone. You, can't however, call the watch number directly, if that's how you are testing it. Call someone and have them call you at your phone's number.
Have you bought or paid for carrier service for both devices? To use lte, you need to pay monthly to get another number with service. Unless you want the same number in this case, keep your phone next to watch.
