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An eSIM (embedded SIM) is a form of SIM card that is embedded directly into a device as software installed onto a eUICC chip. First released in March 2016, eSIM is a global specification by the GSMA that enables remote SIM provisioning; end-users can change mobile network operators without the need to physically swap a SIM from the device.
[1] [2] The specification was originally part of the GSMA's work on eSIM [3] and it is important to note that remote SIM provisioning is just one of the aspects that this eSIM specification includes. The other aspects being that the SIM is now structured into "domains" that separate the operator profile from the security and application "domains".
On April 14, 2021, the Galaxy Note20 Ultra 5G T-Mobile updated software to support eSIM and dual SIM (DSDS). Other carriers still do not enable the two features even though the Galaxy Note20 Ultra already supports eSIM out of the box.
This is mainly important for international mobile roaming. Outside North America, the IMSI is converted to the Mobile Global Title (MGT) format, standard E.214, which is similar to an E.164 number. E.214 provides a method to convert the IMSI into a number that can be used for routing to international SS7 switches.
Some mobile phones support use of two SIM cards, described as dual SIM operation. When a second SIM card is installed, the phone may allow users to switch between two separate mobile network services manually, have hardware support for keeping both connections in a "standby" state for automatic switching, or have two transceivers to maintain ...
The universal integrated circuit card (UICC) is the physical smart card (integrated circuit card) used in mobile terminals in 2G , 3G , 4G , and 5G networks. The UICC ensures the integrity and security of all kinds of personal data, and it typically holds a few hundred kilobytes. [1]
After 2 years of R&D Samsung developed its first mobile phone (or "hand phone" in Korea), the SH-100 in 1988. It was the first mobile phone to be designed and manufactured in Korea. But the perception of mobile devices was very low and although Samsung introduced new models every year, each model sold only one or two thousand units.
Samsung Galaxy Duos have a menu option entitled “Dual SIM Always On” which when activated, activates call forwarding on the carrier's network. This can be done manually on any phone, regardless of manufacturer, e.g., enable call forwarding to SIM 2 when SIM 1 is connected.