2Phone can make your iPhone 4 Dual SIM Dual Standby or Dual Mode Dual Standby.Two SIM cards online, no need to switch network, then you can enjoy calling, phone answering and message sending. ------------------------------------------------------------------------------------------------------------ Compatible with: Apple iPhone 4, 16GB/32GB Condition: your iPhone 4 must be Jailbreak ------------------------------------------------------------------------------------------------------------ Power & Battery Battery:3.7V/800mAh Input/Output:5V/500mA Talk time:500min Standby time:288h Internet Use Network 3G:up to 6h Network WLAN:up to10h Video play:up to10h Audio plat:up to 40h Language£ºEnglish ,German, Simplified Chinese, Traditional Chinese Dimension Weight & Height: 126mm Width: 61.8mm Thickness: 16.3mm Weight: 59g ------------------------------------------------------------------------------------------------------------ Package include: 1 x 2phone case,1 x Phone border,1 x USB charger cable,1 x English user guide,1 x Chinese user guide 1 x 800mAh battery Available colors: Black. ------------------------------------------------------------------------------------------------------------ Installation Instructions: First Step: Jailbreak(pls note:your iphone 4 must have been jailbroken,you can get the method of jailbreak by google) Second Step: To install 2phone software via wireless network (3G network or WIFI)