I know you are familiar with Chinese iPhone clones supports Dual Sim, but this is for real iPhone 4. usbfever.com added an interesting case for iPhone 4 in their catalog that allows using two Sims in one device! iPhone 4 Dual Sim adapter case isn’t beautiful to see but certainly is functional! The good thing is that we do not need jailbreak * and we have just any version of firmware to run the adapter, since it is not necessary to use any external application, but since ** Preferences> iPhone> SIM Applications can choose the card want at any time.
To make matters worse, the software is not as well done it should, and the iPhone takes longer than two minutes to change between a card and another. The adapter will cost $ 28.99 and can be purchased at this link .