Re: Does your gs3 get warm quickly?
Mine does get hot as well. But trying to exchange it probably won't help it.
I have also noticed that while doing anything that uses 4G, internet, wifi, or streaming music will increase the heat of the phone regardless of "venting".
While streaming music in my car with the windows down in summer My G3 120f but still ran fine. This was due to the data usage and charging at the same time. I have also streame music, charged, and used gps w/ Navagation and seen no change in the heat to the prior test.
My older Droid X near the end of the contract started heating up to 118f using the same set up, but was unable to charge past when i plugged it in. I found that by turning the screen off (lock key) it allowed the device to not only charge but cool down.
So I would say that the heating up is just due to screen + data usage + charging so heat is a givin.
Also for the battery life, anything involving data seems to sap the hell out of the battery. also the area your in that effects your radio as well. In my Doctors office i get no signal and i can watch the battery drop 1% a min while it is sitting in my pocket. I end up putting it in airplane mode and the battery won't drain.
Again my droid X was the same way and while at work i would just turn data off (because it was spoty at best bouncing from 3g to 1x to nothing and around) and my battery went from lasting me 6 hours to lasting me 3 days with no data turned on.
My conclusion is that the Radio they used in the devices is what's chewing all the power. But we wanted 4G =3.
Hope some of this might help.