Swapping around your SIM card into different devices? This trio of SIM adapters helps so that you can use one SIM card for various size-needs. Two adapters fit Nano-SIMs (~12mm x ~9mm x ~0.7mm) and one fits Micro-SIMs (~15mm x ~12mm x ~0.8mm). In our two examples we broke down our GSM 2G SIM Card from Ting & Adafruit to it's smallest Nano self. Once in the adapters, they will fit 'plain SIM' devices