Date registered: Dec 2002
Vehicle: 92 500SEL to 01 E320T current 2014 lexus LS460
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Quoted: 3 Post(s)
As Musicman indicated, Tel-Aid was an analog system that was administered by a company in Dallas in partnership wit ATT. With the demise of analog MB switched to digital, and I think a dfferent administer was selected. The new company is EMBRACE, but you will need new equipment, some dealers offered a conversion kit but it was pricey.
Mercedes had Motorola build proprietory phones that were locked and could not be moved to other carriers, they could have done Blue Tooth early, BMW also did one of those deals with a custom phone from MOT