Intermittent problems making or receiving calls

[Megmeghello]

Hello I updated my phone to the iphone 16 pro just over a month ago and have been having problems making and receiving calls this last week but only on the occasion.

Most of the time my calls will go through with no issues and then occasionally I will get a call and not realise until I receive a message saying I have a voicemail or a message from the person contacting me to ask why I haven’t answered. I never receive a notification for the missed call and find I can’t call them back when I try.
There is no error message no dial tone nothing and I will have signal the whole time. I can use data/wifi fine to facetime them back and can still receive messages.
I have turned off live voicemail but that hasn’t improved and there is sometimes a long delay between dialling and connecting. I am worried because if I need to make a call in an emergency and this happens at the time I will be completely vulnerable. 

[PeteG]

Hello, Meg. 

Oh, that's quite strange. I'm unsure what would be causing that to happen on a new phone. I'm assuming the last phone you had didn't have this issue? 

It might be worth trying to complete a reset of the network settings, found within the Reset menu options on iPhones. This will ensure all network settings are optimal. If that doesn't help, I'd recommend trying to disable the Wifi calling feature on the phone in order to rule out any possible issues caused by that feature, then test again for a while. 

Pete.