I had AT&T for years. It was ok. Good quality, but a bit more expensive than others. I now have T-mobile. Reliability is a little bit lower, and customer service is worse (which you really don't use that much) but overall cost is much lower. As a big plus, you can use your phone as a hotspot for free for your other devices, which AT&T wanted $45 month for. Also nice is that streaming services are not included in your data use.