1) Band 12 is T-Mo's 700 MHz band. It may not even be in your city. Ask at a store. The N5 supports T-Mo's two other LTE bands (2, 1800 MHz; and 4, 1900 MHz) just fine. Band 12 has better building penetration but it's slower. Lots of N5s on T-Mo with no problem.
2) If it's cheap, and you have chargers everywhere, why not?
If you can wait, see what the new N5 looks like. The leaked pics make it look like they squeezed the larger screen into the same-sized chassis, so it may not be too bad. Plus, when it comes out more people will dump their N5s, so used ones will get cheaper.
--Qfg
09-11-2015 10:56 AM