Why is Sprint hanging on to iDEN?

It's been a very long time since I've heard the unmistakable "chirp chirp" of a push-to-talk (PTT) phone. Many people have forgotten about Nextel and Sprint iDEN users over the years, but Motorola hasn't. They've been there offering up some of the most durable phones known to man for those rough users, and now they plan to work with Sprint...

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Source: http://toysandgadget.com/phone-mobile/why-is-sprint-hanging-on-to-iden/