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      The triggers are not based on user activity. There is no signaling between the SIM and the phone that would indicate user activities that do not explicitly require the SIM. Again, the SIM has opportunities to request information about user activities, but it does not make such requests.

      Do you know what kind of user activity the SIM is able to request here? Presumably this would have to be documented for different OS vendors to implement.

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        This is so interesting. Is there a good list of capabilities the SIM has? Is this different with eSIM?

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          Do SIM cards change much over time?

          I’m realizing now that I don’t think I’ve changed my SIM card since I got an iPhone 3G around 15 years ago (although my memory might be faulty). After several trimmings it’s still the card I use today.

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          Presumably the UK networks are doing similar, after most (but not all) phone OS updates, I get a “welcome to $network, here’s how to setup mobile data, yadda yadda yadda” SMS from the network. Seen it happen across four major networks[^1] in the last 5 years, presumed it was somehow triggered from the phone reporting firmware version to the cell tower but this maintenance SMS reporting in makes more sense.

          [^1]: 3, EE, O2, Vodafone