Personally I think the SAP is a much better system and has the ability to also fall back to non SAP mode. So it works like the GSM system (cradleless) but also has SAP.
With SAP you no longer need to put the phone in a cradle for better reception and battery charging ast he car is the phone and your phones GSM section is disabled. Plus you get TEXT messages with SAP and you don't forget to take the phone out of the car when leaving.
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