I have been using my iPhone 5 since last November, 2012. Lately, I've been having trouble holding a 4G LTE signal in areas that are supposed to have LTE according to the Verizon coverage map. When using the phone in areas that have 5 bars of signal, my data connection will fluctuate from LTE to 3G to '0" (1X). I have been reading that others have similar problems so I think the problem is with Verizon's network.