After having AT&T service for many years, I opted to switch the family to T-Mobile last year. It only lasted three months. It's true that their network is blazing fast when you have a good connection to it. Unfortunately, their network was extremely spotty on coverage. We have three locations where we regularly need reliable indoor service. T-Mobile failed at all of them. Calls would drop or service was completely unavailable. These aren't rural locations. We're talking Detroit and Ann Arbor, Michigan. Since none of our phones were under contract, I switched back to AT&T. It's more expensive and not quite as fast, but it's worth it because it actually works.