So, how do these smart SIMs do all this? They use special technology. It is called eSIM or embedded SIM. An eSIM is built into your phone. It's not a separate card. Thus, you can download profiles. These profiles are like digital SIMs. Furthermore, these digital profiles store your number. They store your network details. You can have many profiles. But only one is active at a time... b2creviews.club