Recs.
Updated
GTA San Andreas is a 3D open world action adventure game ported from the Rockstar classic. It contains everything from the original, but has been tweaked to work with touchscreen controls.
SpecsUpdate
Pros
Pro Tons of content will keep you entertained for a long time
You could spend days going through just the main story itself, but there is a ton more content as well. Side missions add numerous more hours of gameplay, and one-off encounters can help keep you entertained as well. Depending on your mood, you might even just want to try abiding by all the laws and driving around. In-game, there's always something to do, and you have a choice of what you want to do during that particular gaming session.
Pro Familiar multi-city world that is actually based off of real locations
There are 3 huge cities to explore: Los Santos, San Fierro and Las Venturas - each loosely modeled after certain real-world cities. In addition to the static map, other aspects of the game make it feel even more immersive. There's a fairly wide selection of vehicles, minigames and weird one-off events to find and take part in.
Pro A classic that translates great to mobile thanks to attention paid to the port
This game was originally launched on PlayStation 2 and Xbox. Tweaks were made to make it more mobile friendly - multiple ways to control the UI (optimized for touch), as well as cloud-saves which let you pick up where you left off on different devices (for example a tablet or a new phone).
Cons
Con The control scheme doesn't translate well to touchscreens
For a game that was originally designed to be played with 14 physical buttons it can be difficult to translate that to a touch screen interface. Sadly, this shows when trying to play on a tablet or phone. To get the best experience, you're going to want to grab a compatible bluetooth gamepad/controller which adds cost, and you'll need to carry it around if you want to play on the go (likely at home you'll be playing on a console or computer).