I've noticed after a month or so of having the iPhone 5 that when the phone rings it drops LTE and switches to "4G" ...this is fine no problem there. The problem seems to be that after hanging up the call or sending it to voicemail it won't auto switch back to LTE...I have to manually turn off LTE in settings then turn it back on to get back on LTE. Anyone else notice this? Also another problem I've noticed which has been around since the 3GS is when on a conference call that I've initiated I don't have access to touch tone menus and the other person on the call with me has to press the buttons when prompted.