The ringtones and alerts assigned to specific contacts stopped working with the new IOS 18.1.1

I believe that this is likely an IOS 18.1.1 issue. A contact updated their phone to 18.1.1 and when he calls me (on my updated iPhone to IOS 18.1.1) I no longer have his specific ringtone although his number was recognised. When another contact rings on an Iphone that hasn't been updated or on Android their specific ring tone works. The only common thread appears to be IOS 18.1.1 on the phone being used to initiate the call. I would say that IOS 18.1.1 is somehow not transmitting a necessary piece of info - odd but a fact. Please Apple correct the issue. Thanks

It's not always the iOS update's fault!  Many things can cause phone problems.  If you tell people you think it's an iOS update, it might make it harder to fix or find a solution for the real issue.

Remember, the right question often leads to the solution!

iOS updates aim to enhance user experience, boost security, and fix bugs rather than disrupt core features. The majority of the issues after updates might stem from underlying, unmentioned factors. Updates won't typically alter personal data but may refine settings or features. Backup before major updates for safety. Review Apple's update details and backup advice for a smooth process.

Kindly consider checking your settings and addressing any device issues before attributing the issue to external factors. This could be a pure coincidence that the iOS update affected the iPhone functions.

Before initiating a standard iOS update, it's advisable to create a backup. Have you completed this step? If yes, proceed with the restoration from the backup.

See what each update does: About iOS 18 Updates, About iOS 17 Updates, About iOS 16 Updates, About iOS 15 Updates, About iOS 14 Updates, About iOS 13 Updates, About iOS 12 Updates, and so on...