Since San Andreas was originally a PS2 game, you can run the original PS2 ISO using a PS2 emulator. This requires a fairly powerful device with at least 2GB–4GB of RAM.
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This article explores everything about the 70MB compressed version, how PPSSPP works, the truth behind the file size, and how to safely play San Andreas on your phone. GTA San Andreas PPSSPP Download 70MB Mediafire: Is It Real