I have a Golf 118TSi with an RCD510 and the latest factory bluetooth. The phone button brings up your six pre programmed contacts, with buttons to bring up your contact list and also the keypad (to manually dial numbers). The latest bluetooth does not have voice activationwhich makes it next to useless to use with an RCD310. The RCD510 is a big leap forward from the RCD310 if you want to use it in conjunction with bluetooth.
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