Max Texture Size (made for older Unity versions that didn't have built-in functionality of this kind)
A script that lets you easily get maximum supported texture size on Android and iOS devices.

It is useful to know the maximum supported size (resolution) of the textures of the Android or iOS device your game is running on. By knowing max supported texture size you can have a single game build with hi-res and lower-res textures, falling back gracefully to lower-res textures on the devices that do not support bigger texture sizes.