inputs.text: gm done - truck contains 2003 onstar unit without bluetooth support looked various options add bluetooth avoid using headset support hands free calling options included upgrading onstar unit newer unit supports bluetooth easy option neither gm onstar support idea shame ford offering upgrades new blue tooth systems guess brand im going look seriously next time back topic gm wont sell newer onstar unit older truck enforced policy eby used sources option new onstar unit secured must programmed correct vin number b another option bluetooth device completely replaces existing onstar unit two different devices exist nicely integrate existing truck audio system two major issues 1 devices replace onstar unit offer bluetooth reduce feature set provided door unlock tracking crash response etc 2 prior steering wheel controls function c external bluetooth device motorola xyz tried number market bluetooth units didnt integrate existing radio onstar system work none provide sound quality offered integrate audio system none provided controls easy use existing steering wheel controls none provides many features last option attempted scosches bluetooth kit gm vehicles one strong selling points product ability integrate bluetooth exist audio system without affecting onstar features onstar works always bluetooth fully integrated gm audio system callerid displayed radio radio mutes call steering wheel controls work paired bluetooth phones link scosche unit someone entersthe truck install took 30 min max coffee no wires cut scosche provides wiring harness ties bluetooth unit standard gm wiring harness unplug gm radio harness plug one end scosche harness plug end radio scosche bluetooth unit comes mic vs using existing onstar mic view additional mic one minor short coming scosche solution required 15 extra mins 30 mins total install located additional mic near existing onstar mic perhaps gm testing best mic location phone calls clear callers stated no trouble understanding every word ive received no reports echo wind noise issues great product ps wonderful unexpected feature a2dp support allows many phones android phone play pandora radio music collection stored phone via bluetooth radio truck gm installed bose system digital internet radio via a2dp sound quality amazing no amfm radio static xm dropout high quality sound road