how to stop a popup option of audio output during call on iPhone

I have an iPhone 11. But the same issue was on my previous iPhone 7.

Bluetooth is OFF and is never on.

I do not have linked calls set up. I never have had linked calls on this phone.

During call normally you can tap on the speaker button and audio will output from the speaker. But when I tap on the speaker, it appears an option with choice. So every time I need to tap on the speaker button and next choose one of two options: audio or speaker.

Again: I have never had of any other Bluetooth speaker devices. And this is really annoying when I need to change audio output to speaker with one tap on the button I get a choice and have to tap a second time.

I use last version of iOS. I tried to reset the iPhone. As I said there was the same issue with my iPhone 7. So I think it somehow connected with my Apple ID or iCloud maybe idk.

Please help how to get rid of this.