Got This Phone August 20th. Have been having that issues on and off ever since. I Am On my 2nd replacement phone and today I have had this issue the entire day. I have turned Airplane mode on and off countless times, reset the phone to factory settings, took the SIM out put it back in. Called AT&T spoke with them countless times. They want me to got to a store to check it out. I work 80 hours a week it is such an inconvenience for me. Probably going to need another replacement phone. I was an iPhone girl, this my first Android and I'm ready to switch back.