Thinking of successful products that aren’t in Europe, what ever happened to Push To Talk?

Unlike i-mode that had little support from handset manufacturers, Push to Talk can be found in many recent handsets from Nokia and Motorola.  To be launched in 2004 and marketed as a premium product to the business community, Orange thought they had a lead on their competitors.  Unfortunately for Orange it rapidly faded as it was more expensive and proprietary than the successful US model. 

So will another network oblige?  At this rate I don’t believe Nokia customers will be popping the champagne anytime soon.