Dual Simcard Adaptor for iphone 3GThe World First Dual Simcard Adaptor for iPhone 3G/iPhone 3GS. No More carrying 2 Phones Around and No More Misplacing of your sim cards, stay organized . A very simple put Powerful STK menu to select default number for making calls, use any of the 2 numbers to make call at any time and divert the primary number to receive calls on both numbers. Very simple operation, Easy Plug-&-Play Support UMTS/3G Cards and 3G Networks STK Menu No need to cut your simcard Work perfect with 2mm silicone caseInstruction:1. Enter your phone menu and select Q Dual SIM Card, it shows: (Refer to picture No.6)*SIM-1SIM-2Auto/SWSetup2. If you want your SIM Cards work separately, selectSIM-1 or SIM-2 directly, (*) stands for choosing successfully.3. Select Auto/SW (*shows before it), then SIM-1 and SIM-2 will auto-switch online.4. More functions under Setup menu, the submenu will appear:SIM1 No.SIM2 No.SIM1 time: 03SIM2 time: 035. Select and enter SIM1 No. or SIM2 No., you can edit card number within 11 words, then the edited numbers will be displayed on the screen instead of SIM1 or SIM2.6. Select and enter SW time: 03 for setting the auto-switching time between 0 and 99 minutes. The system default setting time is 3 minutes, and Max 99 minutes available for setting the auto-switching time.7. Language can be customized according to the requirements.