2 ms·

How do SIM Cards work? [video]

• ColinWright 3y ago
  Comment on social media where I first saw this: "SIM Cards are actually tiny computers that have a filesystem and run Java apps that communicate directly with users ..." -- https://mathstodon.xyz/@codepuppy/111141594244217815 https://mathstodon.xyz/@codepuppy/111141594244217815