embedded sim

An eSIM (embedded subscriber identity module) is a form of SIM card that is embedded directly into a device as software installed onto an eUICC chip. It connects to mobile network operators via remote SIM provisioning and users can change mobile network operators without the need to physically swap a SIM from the device. Most flagship devices manufactured since 2018 that are not SIM locked support eSIM technology.
Several eSIM plans can be stored at the same time and there is no need to obtain, store, and insert/eject (and potentially lose) small physical SIMs. Users can change plans or carriers instantly online.
eSIM plans cannot be easily transferred to another phone or reactivated if removed from a phone; the process usually requires technical support.
If a phone is bought directly from a carrier with a SIM lock, the phone can only add eSIMs from the same carrier as the one on the physical SIM card, even after a carrier unlock.

View More On Wikipedia.org