I am planning on buying a sim-free unlocked iPhone XR, to upgrade from my iPhone 8 Plus. But will the SIM card that is in my iPhone 8 Plus work with the iPhone XR? Do they have different technologies that make them not work with each other?
Also, just as a hypothetical, could you use a SIM card from an iPhone 6 Plus in an iPhone XR?
Also, just as a hypothetical, could you use a SIM card from an iPhone 6 Plus in an iPhone XR?