I personally have T-Mobile. I actually live in Chicago so the coverage isn't bad at all with their LTE network. I switched to them from AT&T due to no long term contract commitment, international data coverage (I travel for a living so this was important) plus their unlimited plan. They do have the option for you to roll the cost of your device into your monthly payment which is nice if you don't want that hefty 600 buck cost up front. The other thing I like about them is the ability to use WIFI as a tower. When I'm inside my house, I use my WIFI mostly for calls and not the actual cell tower. This works as well anywhere including overseas. All in all, I've been very pleased with them. Naturally, like most carriers, you will find some areas where the signal isn't as strong but I've only encountered that once in the middle of no where Ohio.