I apologize for a duplicate thread if one exists. I recently took my unlocked T-Mo LG 2 D801, with Kit Kat 4.4.2 on it over to AT&T. Now, I have a couple questions. I'm confused on whether loading AT&T software will help improve phone performance or should I leave it alone? And if I do that, can I add the LG G3 load on it or is that something out of my league? I, sincerely apologize for bringing up possibly old, previously discussed items. I'm pretty new at the whole flashing/rooting stuff. I'm an ex-Apple guy who got bored. Any advice or steps to take would be appreciated. Thanks.