My experience has been quite different. A while ago I was considering switching to T-Mobile so I ordered a SIM, but a few days later I changed my mind. I called

My experience has been quite different. A while ago I was considering switching to T-Mobile so I ordered a SIM, but a few days later I changed my mind. I called T-Mobile to find out how to cancel it, and I was told just to refuse shipment, so I did. Next month I get a bill for a month of service for a SIM card that was never in my position, and thus never even activated. I call up and eventually they dropped the charges (or so I was told). Next month I get a bill for $12. Lather, rinse, repeat. In my experience, the T-Mobile reps, at least those dealing with user accounts, are either unwilling or incapable of performing competent customer service. AT&T, on the other hand, I've had nothing but the best service with. I can literally call them any time of the day and there's someone that answers and takes care of whatever issues I have.