If you’ve ever changed networks with a mobile phone, you’ll know about SIM cards. These days, they come in a hybrid form designed to fit phones of all sizes. When you want to change networks, it’s as simple as taking the old SIM out and putting in a new one – that is, if your phone is unlocked! However, this is not the only way users can change networks, as Embedded SIM cards (eSIMs) are beginning to gain traction.