The original Prison Life has known issues on mobile. Buttons are small, the inventory is clunky, and frame rates can drop. The "Portable" versions usually have rewritten UI handlers specifically designed for thumbs, making the game viable for the massive mobile Roblox audience.
It is important to note that "Prison Life Portable" was slightly different from the main game. uncopylocked prison life portable
If your "portable" version is crashing, check for these three issues: The original Prison Life has known issues on mobile