Can't hang up a call

[RedEyeRon]

My wife bought an iPhone 11 Pro a couple of nights ago. This afternoon I asked her to call me from her phone. We were sat next to each other at the time.

She calls and my phone starts to ring. After a few rings, I say 'OK, you can hang up now'. She's staring at her phone and I can still hear my phone ringing.

Turns out that she couldn't find a way to hang up the phone. She had to reset her phone, which I thought was hilarious. I jokingly said that she should take it back for a refund. 

She then asks me to call here. Which I dd. Turns out that I had exactly the same problem. I called her. Heard the ringing. But couldn't hang up. She dismissed my call but my phone continued to ring. There was no button to stop the call. 

Anyone experience anything like this before? 

We're both on Freedom network. I've got the Note 10+ and she has the iPhone 11 Pro 

[Seawitch69]

There is no"dial pad" setting for that function.  

I  went to dialer and press the menu and there's nothing for that function any longer

[carr0498]

They changed it to "press the side key to end calls"