Past few days I have been stuck in 3G on my bionic. I went to phone info and changed it to 4G, but everytime I do that i Just get no service. I've turned my phone on and off multiple time, entered recovery mode and cleared my cache and still no 4G. I have used 21 GB of data this month because I have unlimited. Does Verizon cut off 4G service for using too much? Any ideas on how to get 4G back?