New 15 Pro Max won’t receive imessages or texts unless I’ve sent one first. Nobody can reach out to me unless I have already messaged them.

It sounds like there might be an issue with your messaging settings or possibly a network-related problem. Here are a few steps you can try to resolve the issue with your iPhone 15 Pro Max:

1. Check Network Settings:

• • Ensure that you have a good cellular data connection or are connected to Wi-Fi, as iMessage requires an internet connection to function.
  • Sometimes turning on Airplane Mode for a few seconds and then turning it off can help reset your network connection.

1. Restart Your iPhone:

• • Restarting your device can often solve temporary glitches including issues with messaging.

1. Check iMessage Settings:

• • Go to Settings > Messages and make sure iMessage is turned on.
  • Tap on "Send & Receive" and check the addresses and phone numbers listed under "You can receive iMessages to and reply from." Make sure your phone number and Apple ID are selected.

1. Update Your iPhone:

• • Go to Settings > General > Software Update to check if there is a new version of iOS available. Installing updates can help resolve software bugs that might be causing issues.

1. Reset Network Settings:

• • If the issue persists, you might consider resetting network settings. Go to Settings > General > Reset > Reset Network Settings. Note that this will erase all current saved settings including Wi-Fi passwords, VPN, and APN settings.

1. Contact Your Carrier:

• • There might be an issue with your SMS service especially if regular texts (SMS) are also affected. Your carrier can verify if there is an issue with your account or network coverage.

1. Contact Apple Support:

• • If none of the above steps work, there might be a more complex issue at hand. Contacting Apple Support can provide more specialized troubleshooting and support.

Starting with these steps should help identify and possibly resolve the issue with receiving messages.