Use two SIM cards on one Samsung Galaxy S4
The dual SIM card adapter is the perfect choice for business use and those who make a lot of international calls or even couples who share the same phone.
By plugging straight into the Galaxy S4 SIM tray with no wiring or soldering work needed, this adapter couldn't be simpler to use.
The Dual SIM adapter allows you to switch between your SIMs in two easy clicks through your phone's existing menu.
Now you can handle all your calls on the same phone!
Note: The back cover will slightly swell while attached the Dual SIM Adapter. Need to restart your phone after switching between the SIM cards. May not work properly with 4G LTE networks and functions.