There seems to be a sudden upswing in interest in full cellular VoIP at the moment, after everything went quiet in the summer. Last week we had the fring/Mobilkom announcement, and I also had an interesting chat with Ross Brennan at Cicero Networks about VCC and the challenges of hand-off from LTE or WiMAX VoIP back to mobile circuit telephony.
Yesterday I spotted VoIPo3G being used on a notebook "in the wild" by an ordinary consumer.
And next up is the iPhone.
Tip of the hat to Alex Kerr over at Forum Oxford (and www.phonething.com ) for pointing me towards the first (?) implementation of VoIPo3G on the Apple device, albeit only with a jailbroken one.