I'm sorry to learn the 4G speeds have been slow for you. That is obviously the largest benefit of the LTE network, so I want to see this working properly for you. Are the speeds slow in a particular area or location like home? I suggest removing the battery and SIM card from the device (begin with the phone powered on), leave out for 20 seconds, then reboot the device once the battery and SIM card are back in. You should then see an increase in speeds. Keep me posted.
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