Why can't I get Sony Xperia X10 Mini Pro mobile to pair up with headset?

Cat

Member
I have a Sony Ericsson headset (not music-type, but the ones that hook around the ear) that I use while driving to answer my mobile. It's a few years old & it works just fine with my older phone, a Sony Ericsson C902. Do I need a different headset or am I doing something wrong? The Bluetooth works on the new phone, it can see other phones and vice versa.
 
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