I was looking at buying an iphone 3GS but after discovering that apple are expected to announce the release of the iphone 4G in june (or possibly sooner because of the google nexus threat), I thought it might be best to wait until then and get one of those. However after looking up the state of NZ's mobile network the only estimate on when we'll have a 4G network is 2013.
So my quesiton is will there be any significant problems using an iphone 4G on a 3G network?
And also what kind of time delay should I expect between apple's release of the next generation iphone and its arrival in NZ?