Callstel Dual SIM Adaptor iPhone Dualsim Dualsim Adapter for iPhone 4/4S with Second SIM Card Slot for iPhone 4): Amazon.de: Electronics & Photo
iPhone5/4S/4 Dual SIM Adapter with Case R-SIM15,R-SIM14,GPP,GEVEY,HEICARD,HEISIM,RSIM 10,RSIM11+,RSIM 9 PRO mini air Unlock,iPhoneX,iPhone8,Firmware,Any version, No jailbreak