If you still have the original cartridges, highly recommend getting a ModRetro Chromatic or an Analogue Pocket to replay them. I have the ModRetro and it has been a lot of fun rediscovering my old childhood games.
But I ordered the new Pocket Taco, which is like a controller that is taco-shaped and clamps around your smartphone, kinda turning it into a gameboy.
Nokia's N-Gage was a taco shaped smartphone before its time!