Bluetooth Audio and Data

First of all, I hope this thread does not already exist, in that case I apologize and I ask you to share the link of the old one.

I'm going to make very simple smartwatch with Arduino. While planning that I thought it would be very cool if I were able to make phone call from this watch. So I thought it would have been easy to use the Bluetooth module both for general data (like notifications) and audio, but after a bit of googling I've discovered this is false.
Actually I have also discovered that I can't stream audio with the BLE module I wanted to use, so I'm asking you: is there a simple way (especially from the hardware point of view) to do that and which BT module do I need?

Thank you all.

At the time of writing this link was only three posts away from yours