Why does my phone lose connectivity when I receive a message message from a certain number?

It's possible that there is an issue with your phone or with the cellular network that you are using. It could also be related to the particular phone number that you are receiving messages from. Without more information, it is difficult to pinpoint the exact cause of the problem.

Here are a few things that you can try to troubleshoot the issue:

1. Restart your phone: This can often resolve connectivity issues.
2. Check for updates: Make sure that your phone is running the latest version of its operating system.
3. Check your network connection: Verify that you have a strong and stable connection to your cellular network or WiFi.
4. Try a different messaging app: If the issue only occurs when using the built-in messaging app, try using a different app to send and receive messages.
5. Contact your carrier: If the above steps don't help, you may want to contact your cellular carrier for further assistance. They may be able to help identify and resolve any issues with the network.