It does have to be a compatible BT device so check the documentation that came with your earpiece. Generally, you can't, probably because you can buy BT headphones for that. I purchased the Motorola S9-HD BT headphones for music not knowing you can also make/take phone calls. They're incredible and just bought my wife the new S10-HD. But they're not really practicle as a device to use for your phone - especially if you're driving or have to talk to people around you.