Double sim for IPHONE SE

The iPhone doesn't use two physical SIM Card Slots (except in China).

There is one physical SIM card slot and one digital eSIM that you need to activate with your carrier.

See:

Using Dual SIM with an eSIM

https://support.apple.com/en-us/HT209044

If you are from Bangladesh as per your profile, where did you get this iPhone SE (2nd Gen) from?

Do you have iPhone SE (1st Gen) then it only has one SIM.

In both case if your iPhone is locked on to a carrier then you will have to use a SIM only from the same carrier.

Second Sim Card? Where did you buy this device from? Second Sim is eSIM not physical SIM

my phone is not work