This is a Bug which Apple has to resolve many are suffering from this problem and some people give up and think this Bug is unfixable but that’s not the case.
lets see what I got after some research, ever since I made this ambiguous fix I haven’t receive that problem again, I called it ambiguous because I don’t know if this fix is permanent or temporal.
The “Cellular Issue Detected” message on your iPhone could indicate a problem with your device’s ability to connect to cellular networks, which might temporarily/permanently resolve when you change the region(settings>General>Language & Region). Here’s why this might be happening and what you can do to address it,
Why This Happens:
1. Carrier Settings Mismatch:
• Each region has specific carrier settings, and changing your region may update these settings temporarily, which could explain why the issue seems fixed but not permanently.
2. Unsupported Bands/Networks:
• Some regions use different cellular bands or network technologies (e.g., 4G/LTE vs. 5G). If your iPhone is not fully compatible with the local network, you may experience connectivity issues.
3. Software Glitch:
• A software issue in your iPhone’s network configuration might be causing this problem, and changing regions forces the device to reset some network settings temporarily.
4. Hardware Issue:
• There could be a hardware issue with the cellular antenna or related components, making the connection unstable.
Long-Term Solution:
for long term solution I think only Apple can do this,
If changing regions temporarily fixes the problem, you might be dealing with a deeper compatibility or network issue. It’s best to address it with Apple Support to get a permanent fix.
NB: change your region to whatsoever you want keep changing as long as the problem keeps coming.
make sure you switch your phone off and on after the change has been met.