https://www.allaboutcircuits.com/news/what-is-an-esim-embedded-sim-IC-STMicroelectronics-GSMA-accreditation/
STMicroelectronics announced in June that it is the world's first eSIM manufacturer accredited by the GSMA to personalize eSIMs for mobile and connected IoT devices. What is an eSIM? How could it benefit designers?
Most people these days have some form of mobile device that can be used to make phone calls, send text messages, and even access the internet. In order for any of these devices to access cell networks, they require credentials and information that include authentication keys, identification numbers, country codes, and more.
All of these details are provided when a user signs up to a mobile service company in the form of a SIM (subscriber identity module) card. These cards contain an integrated circuit and are inserted into a mobile device to allow them to access a network to perform tasks such as make phone calls and receive internet access.