I contacted Vodafone customer support (Tech Guru's) and they said the reason the V3 Sure Signal is no longer being sold is because a new one is coming out soon. Anyone know when the launch date is?
I've been told by someone at Vodafone that they aren't going to be getting anymore because they are preparing for wifi calling as the "Replacement" .. we had a few units on back order for months which eventually got cancelled.
porting your number over to 2degrees is probably your best option at this stage as they support wifi calling, just be sure to double check that your handset supports this functionality before switching !
A shame Vodafone dont have a stop gap solution