Features:
◇ Two SIM Cards available in one mobile phone
◇ Auto-switch between SIM Cards; Enable to edit switching time   
◇ Enable to edit display name of SIM
◇ Perfectly fitting iPhone 4 gives a non-slip coating

Instruction:
 
1, Enter Setup – Phone - SIM Applications, it shows “Q-SIM” menu:
Switch Number
*Auto/SW
Setup

“Switch Number” offers SIM options: “SIM-1” & “SIM-2” which
makes SIM work individually whilst “Auto/SW” makes both SIM work alternately. “*”stands for selecting successfully.
 
2, “Setup” menu provides below options:
SIM1 NO.
SIM2 NO.
SIM1 Time:03
SIM2 Time:03

Edit SIM number(11 characters)by selecting “SIM1 NO.” & “SIM2 NO.”.
Edit switch time by selecting other two options. Default switch time:3min. Available switch time:0 ~ 99min. 

Support : iPhone 4G 4S  (firmware 4.1)
Manual swicth sim card via Home > Setting > Phone > Sim Application.
Easy installation