back in the day, push to talk phones were popular. the idea was that people were picking nextel networks to be part of this PTT network. on the blackberry platform, we have something called BlackBerry Messenger that allows BlackBerry owners to hold instant conversations with other BlackBerry owners. Its a closed network. To get in on the fun, you have to have a BlackBerry too. But is this another story like PTT? I don't know. Interestingly enough, in Indonesia, people are being BlackBerry devices in droves and Facebook and BlackBerry Messenger usage is surplanting voice calls as the primary functions of those phones. Of course, this might have something to do with pricing plans in that region, but then again...
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