I Have a brand new galaxy s5 that will not lock onto 4g. It is constantly on 3g. I have seen that there are others with the same problem but no one seems to have had a resolution. I was really excited to get this phone switching from a droid razr m. I am in Baltimore (21237 zip code) and I know we have 4g lte coverage in our area. I have taken the SIM card out and put back in, rebooted, airplane mode off and on . . . . . . No luck. Any suggestions?