An eSIM (embedded-SIM) is a digital version of the physical SIM card that is embedded directly into a device. Instead of an integrated circuit located on a removable SIM card, an eSIM consists of software installed onto an eUICC chip permanently attached to a device. If the eSIM is eUICC-compatible, it can be re-programmed with new SIM information. Otherwise, the eSIM is programmed with its ICCID/IMSI and other information at the time it is manufactured and cannot be changed. Once an eSIM carrier profile has been installed on an eUICC, it operates the same as a physical SIM, complete with a unique ICCID and network authentication key generated by the carrier. An eSIM is built into newer smartphones, meaning you wouldn’t have to go purchase a new SIM card if you wanted to swap phones or wireless carriers. Some key features of eSIMs include:
- Programmable remotely via software: An eSIM can be programmed remotely via software.
- Multiple profiles: An eSIM allows you to install several “eSIM profiles”, the equivalent of physical SIM cards, with their respective phone numbers and data plans.
- Dual SIM: You can install eight or more eSIMs on an iPhone and use two phone numbers at the same time.
eSIMs are becoming more popular and are beginning to replace physical SIMs in domains including cellular telephony.
