Mobile connectivity issue on a OnePLus 9 pro

Please see if these steps can help: Non-working mobile data / voice calling guide ("APN" / "VoLTE" issues)

If still stuck, can you note your carrier for a bit more debugging?

But also with your other working phone, please get those detailed APN settings from it. If nothing else, then it may possibly be a carrier block for your device, but let’s get APN stuff all sorted first.

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