An anonymous reader writes Laptop Mag battery tested the leading phones on all four major U.S. carriers and found that the same models on T-Mobile typically last 1 to 3 hours longer on a charge. This trend is not new, but has continued for over 3 years of testing. The article says While we don’t know for certain why T-Mobile phones last longer on a charge, there are some strong possibilities. T-Mobile’s network could be more efficient at sending and receiving data because of the bands it uses, or maybe there are far fewer customers on its LTE network, easing the strain. Another possibility is that T-Mobile tends to pre-load less bloatware on its flagship devices relative to the other carriers. AT&T is firmly in second place in the battery life findings presented, with Verizon and Sprint jockeying for last of the four carriers measured. It woud be interesting to see a similar test battery for phones in marginal reception areas; searching for service seems to deplete my battery faster than talking does.