Definitions for "Dual-mode"
(Wireless Phone Feature) A phone that works on both digital and analog networks. It is designed to work inside and outside the boundaries of your particular digital cellular or digital PCS service provider.
All digital phones work both on digital and analog systems, so they are called dual-mode.
(also tri-mode or multi-mode): Handsets that can work with more than one different standard and/or at more than one frequency.
a pretty obvious path as other sources say iDen will be around for a while - It's an extremely knowledgable piece with no misinformation of current state I'd guess this was pasted as a copy from a subscription service only