I was using Htc one and it was getting LTE but I now using iphone 5s for one week and never get LTE icon showing up on my iphone 5s. Anyone getting LTE on your 5s?
Did you move the SIM over from your old phone? If so, did you call ATT? Your new iPhone may not have the right plan on your account so you are not registering with the LTE network.....
Be sure you go to Settings > Cellular > Enable LTE is on (should be by default).
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