LTE is actually more battery efficient. Where you run into problems is many carriers only upgrade a certain number of their towers to LTE. That means a lot of the time your signal is lower than if you were on [3G] mode. Lower signal means your phone has to pump more power into the radio for it to keep a live signal. Generally there isn’t a huge amount of difference though so it just depends on if you want that extra couple percent. I personally would just leave it on LTE. The extra speed is worth any possible minor battery drain.
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