How do I check if my GALAXY A3/A5/A7 support Dual SIM?

There are three possible ways to check whether your device supports dual SIM cards or not.

Method I

Dial *#06# ; if the Smartphone supports dual SIM, then there will be 2 IMEI numbers; if not, then there will only be 1 IMEI number.

Single SIM card Model

Dual SIM cards Model 

Method II

Tap Apps > Settings to check whether there is an item called "SIM card manager".

Dual SIm card models contain SIM card manager but single-SIM models do not.

Method III

If you are not sure if your device supports Dual SIM functionality or not, you can also check the details on the SIM and SD card trays.