In order to achieve dual-SIM support for your Galaxy S7/S7 edge, you need to heat up the nanoSIM for up to 1 minute and remove the chip. After you’ve successfully removed the chip from the nanoSIM card, you will have to attach it on the microSD card in a way that it will fit the SIM tray.
The only thing that remains is to align the microSD card that also features the nanoSIM chip glued on the outside, into the SIM tray. If you manage to do that correctly, yourGalaxy S7/S7 edge will have dual-SIM feature enabled, as well as expanded microSD card storage.
Firstly, you need to recognize the damage before taking the process. Also, there’s a chance that you might damage your memory and/or nanoSIM cards in the process so have that in mind before trying this at home. You must do the following steps carefully to make your Galaxy S7 become more perfect. The process takes some time and involves a pair of scissors, a lighter and some luck.

The dual sim tray to put 2 sims and SD card

Cut the copper of the sim

The sim is glued with the SDcard.

The Sdcard and sim are put on SD tray.