Hey e.cachucho
No this is not officially from Vodacom, but as I was visiting my mom in the UK last week and told her about my Blackberry which didn't survive the fast spin cycle in the speedqueen, she surprised me with a pay & go iPhone from O2.
As for the support from Vodacom?? Well I'm first and foremost a Vodacom client, have been since '95 (I know loyalty smoyalty) but the reasoning my mom had was since vodacom was supporting the iPhone in SA anyway there should be no reason for them to not support any iPhone even just visiting SA. Must say the UK mentality is quite different than the SA thoughts on support/service, I also have my doubts.
From the registration process I've seen up to now I'm with Vodacom3g on the fact that it probably is only apple not recognising my sim card yet, I will test again tonight since it seems they will be launched in SA today!