It's not a special card in that way -- your regular mobile provider SIM still works just as always. The Microsoft "special" sim card is presumably a standard m

It's not a special card in that way -- your regular mobile provider SIM still works just as always. The Microsoft "special" sim card is presumably a standard multi-MVNO sim card with (presumably) some nice app for buying service. Similar to Apple SIM or Google Fi. It's nice to have for people who and aren't carrying around SIM cards to swap around. (Maybe they don't know what a SIM card is, or maybe they haven't had time to burn 2 hours in a mobile provider shop to get one). They can buy a device, turn it on, and the app walks them through buying data automatically so everything "just works".