iOS-specific: common causes and fixes

Instructions:

1. 
   Update iOS:
   
   
   Settings → General → Software Update
   
2. 
   Check provider settings:
   
   
   Settings → Mobile Network → Provider
   
3. 
   Remove eSIM profile twice and reinstall
   
   (delete profile, restart device, then scan QR code again).
4. 
   Reset network settings:
   
   
   Settings → General → Reset → Network settings
   
5. These steps resolve most iOS-specific connection issues with eSIM profiles.