iPhone connects to Bluetooth speaker when on a call

[Mildredop]

I'm new to iPhone, so please forgive my ignorance.

I have a Sony Bluetooth speaker (SRS-XB31) which, in the iPhone's BT settings is set to "Speaker". I'll happily be listening to music, and my phone will ring. I'll answer the phone as normal and chat away - all is good.

Then after a couple of minutes, the phone switches to the speaker. So I tap the BT symbol on the phone and re-select "Phone" as the audio. Ten seconds later, back to the speaker. This battle goes on until the other person hangs up because they can no longer speak to me.

This wasn't a problem with my Android phone, so I'm pointing the finger at the iPhone 12. Any way of explaining to my phone that I don't ever want to take phone calls via my BT speaker?

 

[Whizpopthat]

Honestly, I /think/ I've noticed this before when using my BT headphones, if you are jailbreak savvy I wonder if there is a tweak to prevent it as I don't think there is a setting to disable this in stock FW. My best solution I can give you is to just turn off Bluetooth when you get a call. Sorry, I'm not much help but that's probably your best option.

 

[BrianBaughn]

You can't tell the iPhone to ignore the Sony for calls OR tell the Sony to ignore them…both devices are lacking!

For that particular speaker, according to the manual, if you had it connected to two devices via BT the handsfree/calling feature would be disabled.