I was landing at KLAX, ground sent me a guard message while I was still on runway so I ignored it until I had B-747-8F completely off the runway. Once I got it off runway and stopped on taxiway, I contacted Tower to change frequency. I got approved for change in frequency to ground.
Behold, there was no ground frequency for me to select. There were two frequency options, Tower and Unicom. Ground keep on sending me guard message, but I had no ground frequency shown for me to select. I’m not sure if someone was playing troll on me by going on and off. It eventually appeared after I already taxied to nearby gate.