I had this problem this morning. I called Verizon and they informed it was a 4G outage. They also told me to switch to CDMA only but I couldn't get 3G. They wanted me to power off pull the battery and remove Sim card but I didn't have time because I had to get to work. Shortly after all this my 4G came back on and I no longer had any problem. When I changed the setting from LTE to CDMA I did not get 3G but 1X. So I changed setting back to LTE and got 4G back. Maybe if I would have power cycled the phone, removed Sim Card maybe I would have gotten 3G. The bottom line is on Tuesday there was a nationwide outage of Verizon 4G which quickly came back on.