Bluetooth cordless phones

Not T-mobile specific, per se, but I'm a Tmo user and don't like
multiposting NGs.

Does anyone use the cordless phones (meant for landline) that work with
cell phones via bluetooth? Does it work well, sound okay? Or is there
other technology that allows use of cordless phones over one's cell
phone? Thanks.

I dunno who wants to use their cordless phone over their cellphones...why not use the mobile phone itself. I haven't see a cordless phone with bluetooth but for sure theres one around.