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"The unlimited text, picture, and video messaging that Verizon customers on plain-vanilla plans have enjoyed for a few weeks now is moving on to spread its love to other segments of the market. Push-to-talk plans are next, with unlimited messaging running $20 above and beyond the standard plan cost -- a tad steep, yes, although it includes messaging on any network. With the new feature, individual PTT plans start at $70."^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.engadget.com/2007/05/29/verizons-ptt-plans-get-unlimited-messaging-too/>