Overheating is most noticeable when playing a lot of music videos or on an hour-long conference call. This is when I handle the handset most often. Sometimes with wi-fi on ... sometimes with 4G on.
As far as the TMO signal, there is supposed to be a cell phone tower less than 1000 feet away ... basically a straight shot through my open window ... according to the OpenSignal app. The signal fades in-and-out between 2G, 3G, 3G HSPA+ and 4G even when my HTC is completely still.
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