Dualsim Adapter for iPhone 4 The dual-sim menu is automatically installed in your mobile phone Comes with a cover to protect the dual-sim adapter and your iPhone. To setup: Home -Settings - Phone-SIM Applications: select the active simcard you would like to use. Please note that once you've chosen a different SIM card, a message "No SIM card installed" will be displayed on your mobile phone. This appears for 1 ~ 2 minutes, while the phone is searching for the second provider.