The product coming under the codename of SIMable developed by 24/7 Mobile Solutions Ltd is offered for such purposes. It’s described as a universal solution, which doesn’t urge the user to read tiresome manuals regarding specific questions on unlocking the gadget.

According to the manufacturer, it takes you around 10 second to get the chip attached to your SIM card and then the handset considers itself unlocked. At that the guarantee on the phone remains valid, since no changes are made to the hard- and software of the gadget.
Let’s note that the manufacturer guarantees up to 85 per cent of successful cases of using the chip. SIMable is compatible with any handset from any manufacturer including the latest new gadgets with 3G support, such as the iPhone 3G, HTC Touch Diamond and others.
The SIMable chip retails for about $35.