Only getting one signal bar on my new iPhone 14 Pro Max. I've tried everything to fix it, to no avail. Sometimes I lose the signal entirely and it reverts to SOS mode only. My two-factor authentication codes take way to long to arrive, and sometimes I have to turn the phone off and back on before receiving the codes. I'm on an unlimited plan with 5G, but the signal is worse than it was with my old iPhone 8!!