Question about Samsung Evo Plus microSDXC UHS-I

If your mobile phone has a microSD card slot, it should work, but depending on the model, it may be at the expense of the second sim card (multifunction slot on dual-sim phones).

I highly doubt that a sim card fits in all modern smartphones (iphones, dualsim phones without micro-sd option, etc.).

Yes, a micro-SD card fits in all modern smartphones.