Here’s a guide on how to disable 4G LTE on the Nokia Lumia 1020. Why would someone want to do this? Maybe you’re in an area that’s not covered by LTE and you don’t want the phone to waste battery by looking for LTE signal frequently.
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You’ll need to go to Field Test. To do this, you have to dial ##3282# then settings and network type. Don’t touch anything else on the list!