I think GM has got their Onstar program together, they offer certain features at low cost and others at additional. I would pay to get road-aid or crash notification but with MB you only get one version, and pay for airtime. Gm also offers cell type conversation without an additional phone.
I spoke to Tel-aid about such offers, and was told "if you like your cell-phone you dont need road aid"
They are not MB!, the phone is programmed for speed dial, if you want Road-Side the call is transferred to MB in New Jersey