Reece,
The main difference between 2g and 3g networks is the speed at which data can be sent. TBH there is no appreciable difference when it comes to the voice side of things unless you are looking at using a VOIP service which will mean 3g does have an advantage.
With that model phone VOIP is not something you will need to worry about. I'm not sure whether you need to do swap out your SIM unless they are dropping support for GSM. Sorry I've never heard of the Savvynet mob so wouldn't know what they plan to do. If you go with one of the bigger players like Optus or Telstra you'll get better coverage than Voda anyway. I know both of the big two provide GSM support on the 3g network but you shouldn't need a new SIM card unless you are using data services which your phone won't support AFAIK.
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