Then, 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.

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. 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. If you decide to try turning your Galaxy S7/S7 edge into a dual-SIM smartphone, you should know that your nanoSIM must remain your permanent line since it will be attached to the microSD card (literally). The highest risk would be to simply break your smartphone and the warranty certainly won’t cover this type of damage. Your smartphone might get damaged in 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. The process takes some time and involves a pair of scissors, a lighter and some luck. The folks over at NoReplied managed to fit not two, but three cards inside the Galaxy S7 edge: two nanoSIMs and one microSD memory card. The good news is someone has found a way to have it all, regardless of your version of Galaxy S7/S7 edge. However, some markets get the dual-SIM version of Galaxy S7, which allows users to either use two SIMs inside the smartphone, or a nanoSIM and an SD memory card. Samsung has decided to bring back the microSD card slot for the Galaxy S flagship series, so both Galaxy S7 and S7 edge come with one inside.

Nano sim card hack