Dual SIM Card Adapter for Samsung Galaxy S 5 /i9600, S Iv/i9500, S Iii/i9300, Note Iii/n9000, Note Ii/n7100, Mega 6.3/i9200, Grand 2/g7106 by Online-Enterprises Switch between SIM Cards using the SIM Toolkit Application. (Located under "Applications" once installed the adapter) You will not be able to use both sims at the same time because your cell phone only has one antenna. Its like a laptop with one wifi connection. You cant connect to two different wifi sources at the same time with only one antenna. You will have to switch back and forth. This Adapter supports Samsung Galaxy S5 / i9600 / S IV (i9500) / S III / Samsung Mobile Supports Universal GSM / WCDMA / HSDPA / LTE Network (Not tested with CDMA Network although it should work). Switch between SIM Cards using the SIM Toolkit Application. (Located under "Applications" once installed the adapter). No Cutting required. The card slot supports Full Size Mini SIM Card OR Micro SIM Card with Mini SIM Card adapter although you will need to buy a Mini Sim Card adapter separately.