I struggled finding the answer to this one for some tough moments last week before giving up - then I went into a Safaricom store today to grab a USB/SIM dongle for my brother and got the details I needed to make my bluetooth connection work: so I thought I would post this info here and hope that it gets picked up by google for other likewisely-clueless chaps and lasses!
(Posted: Tue June 30/2009)