iPhone 18 pro max cellular issues

New iPhone can’t make or receive phone calls or FaceTimes. Text messages are extremely slow to come through. I can call someone and their phone rings. When they answer it they can’t hear me. On my phone it still says calling, even if the other person hangs up and ends the call it still says calling. It does this with WiFi turned off… it does all of this even when the phone is showing 4 bars of 5G+… then the phone randomly drops service and goes into SOS.

The other part to the problem is that I can use everything else on the phone.. I can use the internet and safari/google, Facebook, Snapchat, Chat GPT etc.. But can’t do any phone calls or FT, and messages are slow to send and receive.

EXTREMELY frustrating situation given that my job is highly highly dependent on being able to receive phone calls as I am on call 7 days a week.

is anyone else experiencing this with the new iPhone 18’s???