Understand what LTE and 5G bands AT&T uses, what MVNOs use the AT&T network, and the best plans currently available on the AT&T network.
AT&T LTE bands: 2, 4, 5, 12, 14, 17, 29, 30, 66
AT&T 5G bands: n5, n260
The bands in bold are AT&T's primary bands that they use for LTE and 5G coverage. Make sure your phone supports these LTE and 5G bands for the best coverage, performance, and data speeds on the AT&T network.