I'm on Verizon, but I would venture to say that any app that looks like a game, or service you don't need is okay to Turn Off.
Look at the Setup/Application Manager/running list.
Ignore all of the .com.android....... things, those are needed.
If the name plainly sounds like an app, ie NFL, Hockey, Angry Birds, etc...
and you have no use for it, Turn it OFF.
Keep a notebook about what you turned off. Turn off something then make sure the phone is still working for you. If so, go look and turn something else off. write that down, test the phone, and look for more to get rid of.
Over a span of a couple of weeks, you will get familiar with the phone, what it needs and what it don't and you don't need, and turn off all the junk stuff.
The result will be a phone that is very efficient on Battery Use.... my phone has been running now 34 hours since the last charge and the Battery Status is 68%. But, I have spent a lot of time learning my phone and turning off things that I don't want to waste battery power on.
YMMV, but if you study the phone, you will be very happy with it.
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