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Rather than analyzing phone carrier, carrier of incoming caller, IOS version etc as I've said people would rather point fingers. Do you want to resolve the issue by tracking down the info or kvetch about it?
 


The issue doesn't appear to be fixed in the latest iOS 11.2.5 software update, and based on the complaints, it would appear that all versions back to at least iOS 11.2 are affected. Earlier versions of iOS 11 could be affected too.

MacRumors hasn't been able to reproduce this issue, and we've seen only a handful of comments on our discussion forums related to the matter, but we did find a dozen more complaints from users across Twitter and Reddit.

Article Link: Apple is 'Looking Into' Limited Reports of Incoming Call Delays on iPhone X

Doesn’t appear to be fake news or limited to IPhone X because I have a IPhone 7 128Gb an iPad 2017 & a Series 3 Nike Apple Watch and the watch & iPad ring at least 5 seconds before the iPhone screen becomes active and it rings. As others have said the call sometimes has gone to voicemail before I can answer on the phone itself.
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In all seriousness, I have this issue. Sometimes it doesn't even ring at all. However, my Apple Watch, my MBPro and iPad all ring...in that order.
Same here except mines an iPhone 7, a MBA, Nike Apple Watch Series 3, and a 2017 iPad. The iPhone is always the last to ring (approx 5 seconds later).
 
I started having this problem recently with my iPhone X. Calls are incoming. But I can't hear or answer them. Suddenly the screen lights up. Other times the controls just freeze and I cannot answer at all.

I've noticed something else. This seems to have coincided with a sudden lack of sound notifications from WHATSAPP.

Yes I've done the hard resets and everything. Nothing changes anything. Just out of the blue one day, after a software update, voila... nada.
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It's time for Steve to give Tim a call.

Except with this problem, Tim wouldn't be able to take the call... d'oh. "Sorry Steve."
 
Sometimes.
My iPhone 11 frequently shows missed calls, delayed calls and messages. It has so many times has gotten very hot to touch burned my ear on more than 6+ occasions! I complained on many occasions even went to the local Apple store it got hot they sent the messages to Apple Corporate letting them know it even got hot in store! I was sent home!! I have went back and forth with Apple Corporate Supervisors on low and supposedly high Personal’s I still have my exact same phone that I paid for in person inside of the Local Apple Store inside of the Kenwood Towne Center Mall before Christmas 🎄!! The last conversation/resolution that Apple Corp. was to give the employee/Representative I was talking to infront of me in the store! Then he would send my phone to corporate officials and then they would expedite/ship me another iPhone 11 but THEY ARE GOING TO PUT A HOLD ON MY BANK ACCOUNT UNTIL THEY HAVE RECEIVED MY IPHONE 11
WHAT OH HELL NO I PAID CASH FOR MY PHONE INSIDE THE STORE SO HELL NO I’M NOT GOING TO LET YOU PUT A HOLD ON MY BANK ACCOUNT MY CASH! I EVEN ASKED FOR A LOANER PHONE UNTIL THE MANY ISSUES/MAJOR PROBLEMS ARE DEALT WITH ON MY PHONE AND THE STORE ASSOCIATE WOULD GET MY PHONE!! TODAY IS JUNE 5TH I HAVE THE EXACT SAME PHONE AND I HAVE MORE ISSUES TO GO WITH THE OLD MALFUNCTIONS!!!
HOW CAN I GET A RESOLUTION FOR MY SITUATION!!!
 
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