Bell

I'm unable to change greeting and not indicating no message even though messages left.

Hello,

I bought iPhone 14 pro max in Feb 2023 with Bell plan. I’ve come to India to visit my family and wanted to use Jio/Airtel SIM services available in India. Whenever I insert any of Jio/Airtel/Vodafone in the phone it says Updating and the next step it shows SIM not supported, either the phone is locked or the SIM not supported. I tried 3 carrier SIM in the phone and it says the same while the other device which I bought this month only on add a line from Bell works with any SIM inserted. I talked with chat service at Bell services and they say your device is unlocked from Bell. I’m not sure what the problem is.