FaceTime and Messenger dropping calls or not even being able to connect

No one of responsibility is here from Apple.

You have signed up into an Apple product user to user technical support community.

We are all, largely, just Apple product users, just like you.

You need to contact Apple support via the contact support link located at the upper right hand corner of every Webpage of these Apple support communities.

Use the Hardware Repair & Device Performance support categories.

OR

by installing and using the Apple Support app found in the iOS App Store.

Tap the iOS App Store link below.

https://apps.apple.com/us/app/apple-support/id1130498044

OR

Call contact Apple via the support numbers found in the link bekow.

Contact - How to Contact Us - Apple

Tap the link below.

https://www.apple.com/contact/

Best of Luck to You!

Hello. I am not, by any definition, an expert.

I have some ideas, not sure if you have checked this. I have the same issue with a few friends, and we determined that it is the wifi provider that is at fault.

Wherever your Dad is, receiving Facetime calls can depend on how strong his wifi is (meaning download speeds). His wifi can also be affected by where he lives, i. a condo or standalone home.

IMO checking his router and/or modem might be a good idea.

I’m having the same problem. My old Generation 5 iPad never had a problem with FaceTime or FaceTime audio. All my WiFi hardware, locations, etc. are exactly the same as I used with old iPad. My brand new iPad Pro drops every call or won’t connect. Just had one session with Apple Support, so I haven’t covered all the ground you have. I’ll continue following up with Apple next week. Hope I have better luck than you. Very frustrating and annoying.

OMG, what a mess. I would keep communicating with Apple since it is still under warranty. Sometimes one tech person is better than another. This is very frustrating.