Am I correct in thinking that any Bluetooth headset will connect to any Bluetooth phone ? I've got 2 Sharp GX15 phones (one mine, one for work) and my private phone I've had connected to a Jabra headset for ages, no problem. I'm now trying to connect the work phone to a Sony Ericsson headset and it's not having any of it.

Will the Sony headset only work with a Sony phone ? Surely not ?