2. definition of eSIM: as an embedded SIM card, eSIM essentially transfers the encrypted data of the SIM card from the original one stored in the UICC circuit (in fact, the physical SIM card we saw) to another hardware carrier of the device itself. At present, the eSIM of GSMA is mainly based on the eUICC, and another eSIM is a pure software form, which is directly integrated into the communication module or chip;
3. About writing cards over the air: Compared with the traditional SIM card, the biggest feature of eSIM is that it cannot be removed, so it needs the corresponding remote configuration ability (of course, many domestic devices are preset directly before leaving the factory. . ), the over-the-air mode is more flexible. In addition to the intra-network card writing of operators, it can also support cross-operator card writing. At least in China, there is still a long way to go. You know the policy reasons ~
4. Regarding whether domestic operators support eSIM: The answer is yes. Domestic operators have been making technical reserves in this area for several years, but at present, if they can truly realize large-scale commercialization, they should move one. The eSIM provided by Mobile refers to the SIM application in the form of pure software, which is directly integrated into the device communication module and baseband chip, without a SIM card entity, and provides one-stop services for eSIM procurement and follow-up technical support, traffic, tariff selection, card number management and equipment management. Of course, if you want to write cards over the air, you can have it ~ (Sorry, by the way, Hey, hey)
5. As for the preset eSIM of Samsung Gear S2 watch, I have only seen the demonstration, and I have not touched the real thing, so I can't make a judgment. However, the function of directly selecting the operator through the mobile phone and writing the number in real time actually involves a lot of problems, at least it can't be opened for a short time. .