For me it’s the notification light you used to find on older phones, was particularly good to know if your phone was charged without picking it up

  • Tier 1 Build-A-Bear 🧸@lemmy.world
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    11 months ago

    It was MST, I know some Samsung phones had them, and it was used at credit card checkouts for stores that don’t have the nft/tap to pay. As far as I know it literally spoofed the magnetic field your credit card makes, so the credit card reader would think you swiped it. Super handy at stores that aren’t caught up with the tech when you didn’t have your wallet lol