This makes it easy to pull out the right SIM adaptor on the go

now my sim works in my K7, S5 and a old Ozzy phone which all are different sizes

Had to downgrade to an older phone that used the micro sim and i had the nano sim, put the nano sim in the micro adapter and put it in the phone and it works perfectly

This sim card adapter kit comes with nano-to-micro, nano-to-full-size, and micro-to-full-size adapters, as well as a sim tray removal tool (this pokes into the hole on the side of an iPhone, for instance, to pop that tray out) and an emory board to help you shave down a too-big sim to fit (you can safely do this as long as you're only shaving plastic and not the chip on the SIM)