Before I got this phone and did some research on it I would always read about the problems people had tethering due to the phone switching off and on from 3G to 4G and vice versa. I always tether on 4G and I never get disconnected. I DID notice though when I tether on 4G that it is faster in the night and sometimes it disconnects at peak hours. Stopping Wifi Tether and restarting it usually fixes this prob tho...