Description:1.Easily to switch 2 SIM cards without turning off the phone.2.No need to cut your SIM card.3.No data loss when switching 2 numbers or turning on/off the phone.Both of numbers on-line at any time.4.User friendly option menu will embed into your phone menu system.5.Very simple operation・ easy plug and play.6.Dual Sim Card Adapter for S3/S4/Note2/Note3 i9300 7100.7.Switching on-line without turning on-off default selection function.8.Very simple operation・ Easy Plug & Play to Let your iphone 4 get Two SIM Cards available in single one mobile phone.9.The adapter connects your current iPhone's Micro SIM with another normal size SIM card.10.Special card IC design compatible with all GSM mobile phone.11.Size:about 3.8cm(length) x 1.65cm(thickness)