Should I turn on LTE on iPhone?

For the vast majority of iPhone users, just keep LTE on , the performance is so superior to the other networks that turning it off, even if it may save some battery life, is not worth the speed reduction.

Voice & Data

AT&T’s 5G E network stands for 5G Evolution, and it’s just a rebranded version of AT&T’s LTE Advanced Pro network that AT&T customers were using before the iOS update . AT&T chose to rename its LTE Advanced Pro network to 5G E because LTE Advanced Pro is said to be a stepping stone towards 5G.