what is a e sim

A SIM card, or Subscriber Identity Module card, is a small chip that stores information about a mobile device subscriber and is used to identify and authenticate subscribers on mobile telephony devices. SIM cards are used on GSM phones and can also be used in satellite phones, smartwatches, computers, or cameras. SIM cards come in three sizes: standard, micro, and nano, but almost all phone companies now use nano SIM. An eSIM, or embedded SIM, is a programmable SIM that is embedded directly into a device and is the first entirely digital card type. It provides the same electrical interface as the full-size SIM cards but is soldered to a circuit board as part of the manufacturing process. In M2M applications where there is no requirement to change the SIM card, this avoids the requirement for a connector, improving reliability and security. An eSIM can be provisioned remotely, allowing users to activate a service plan without a physical card. Phone models like the iPhone 14, iPhone XS, and later all use eSIM technology.