Go read hunterdg's big post in the first page of this thread. According to him it is used. It's M.IP for PAM. Just because it's blank doesn't mean the phone doesn't use it. Example: even M.IP1 is blank when you first get the phone proir to it being provisioned.
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MPx-200 -> MPx(300) -> MPx-220 -> MotoRZR -> Moto V600 -> SMT 5600 -> PPC-6700 -> Treo 700wx -> Mogul -> Diamond -> Touch Pro -> TOUCH PRO 2 -> HTC EVO 4G
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