iPhone Gets 100% Unlocked – Works On Any Network
According to Gizmodo the iPhone is now 100% unlocked using a Turbo SIM card, without depending on the version of your current carrier card.

It will apparently give you full calling, SMS and GPRS data capabilities with any network. No extra hardware is needed, all that is required is an $80 blank SIM and the modification is done via the iPhone.
The hackers are claiming that this method doesn’t use card readers and it doesn’t depend on your previous card version either, so it doesn’t matter if it is a V1, V2 or V3. All of them will work fine.
If these works out to be a good long term unlock for the iPhone, and we don’t get any news soon on the iPhone UK launch, I may be looking on eBay for one.
Gizmodo Via Apple Gazette

Wher can I buy a Turbo Sim Card ?
Hi Shay
I am not sure where you can get them from, I think the guys at Gizmodo have ordered one, lets hope we get an update from them on where these can be bought from.