Old iPhone 7 Plus can't make/receive calls even on WhatsApp

[Branaghan]

We had an old iPhone 7 Plus here, and all of sudden it started presenting a peculiar issue:

- FaceTime greyed out
- It can't make or receive WhatsApp calls
- It can't make direct phone calls with a SIM card in it
- If receives a direct call, it's muted

And yes, this is an iPhone problem, the same SIM card works 100% fine on another phone, the same model we also have.

Also, the same device works fine for playing Youtube, so there's audio. Just not working for all I said.

Is this some malfunctioning audio chip? I brought to a repair store and they said it could be fixed, but what in the world could have caused this?

 

[FreakinEurekan]

I've seen issues with audio on some iPhone 7s. It wasn't common enough for Apple to create a service program for it though. Do a web search on "iPhone 7 Audio IC" and you'll find info.

 

[theapplehead]

Do you know if calls can be made or received over WiFi? Have you tried joining a zoom call just to see if that would work?