Im having issues with the battery and talked to support from tmobile. I am able to go almost 24hrs on a full charge (not using the phone), still on auto sync with gmail and text messages while on wifi and when i flip it to their 4g i get three hours max. Support told me the wifi uses more battery well i think they are complete BULLSHITTERS. So to the other family I know and love. What do you think uses more power? Wifi or 4G. Is tmobile a bunch of ***** and making stuff up to shut me up? Starting to get pissed off at the fact i need to carry a car battery to keep my phone charged while out and about BTW we have a good 4G coverage in the state of AZ.