If you are an iPhone 4 user, i know how much important this would be for you. Yes! here comes some relief for the iPhone 4 users again. The manufactures have built the new case which is capable of holding dual-SIM. However, only one SIM will be activated at a time. This dual SIM adapter case of USBfever, will be latter offered at $28.99.But, to make it work, I mean the case; your iPhone has to be Jailbroken with ultrasnow along with it running over iOS 4.0.0/4.0.1/4.0.2. But, let me tell you something very clearly, doesn’t expect that both the SIM will work simultaneously. It basically, helps you to switch between two GSM networks, without rebooting your device.