Push To Talk

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I was recently in a Cingular store and I was told their new PTT service is going to have a software version for any newer mobile phone that is capable... Did a little search and seen an app for a nokia thru europe[1]; already released a PTT app not sure of technical information on it. Anyone know more on this topic ?

Thanks!!

[1] Nokia PTT App (http://europe.nokia.com/nokia/0,8764,42291,00.html)