There is no official, legal way to play Wii games directly on a smartphone. Wii software is compiled for Nintendo's custom PowerPC architecture and proprietary OS. Smartphones use ARM processors and run Android or iOS—fundamentally incompatible platforms.
Services like GeForce NOW or Xbox Cloud Gaming don't currently stream Wii titles. Nintendo has never licensed its back catalog for third-party cloud streaming.
A handful of Wii games received mobile ports: Super Mario Run (inspired by Wii gameplay), Dragalia Lost (original IP), and some Nintendo-published titles on the now-defunct Wii U eShop. These are distinct games, not the original Wii versions.
For authentic Wii gaming, you need a Wii, Wii U (backward compatible), or a PC running Dolphin with legally dumped games. Smartphone emulation remains a niche, technically demanding, and legally gray workaround—not a practical solution.