I don't use Bluetooth.
One reason is that if working I usually have a headset on with at least 1 earpiece. The Bluetooth if it can be worn may confuse things.
Anyway, I use a speaker phone so it doesn't have to be held up to my ear and also because it is louder if I am in high ambient noise situations.
Something one of my sons taught me for I hadn't thought about it because I usually pause when having a conversation, is that you need full duplex with the speaker phones or parts of a conversation may be cut off at one end or the other.
(Of course you might not have a ADHD child that will talk at the same time you are talking, and not have to worry about that.)