Wow, I had tethering on for say, an half an hour or so. THEN, I touched my phone and it felt hot so I did that phone trick, *#*#4636#*#* and check battery temperature. It was at 47.3 C or 117F Seriously, I had no idea phone could get so hot. It was like the screen and everything. I was using PDANet free. Any ideas on how to keep it cool?