Dear All We are working on a application that calculates an integer value (called hash value of mobile) for mobile device based on Bluetooth services available on mobile phone. I am using following algorithm Step 1: Search all services available on mobile phone. Step 2: Calculate hash value by using formula ∑(chi*reci) Where chi is channel number and reci is record handler ith service. Here we have bit confusion in Step 1 of algorithm. We are not sure about using the service group to search services. We have to choice here either RFCOMM(ox 0003) or PublicBrowseGroup(ox1002). It will be great help to us, if you tell the which option is better and why. Thanks and Regards Ashok Pundit From Chandigarh to Chennai - find friends all over India. Go to http://in.promos.yahoo.com/groups/citygroups/