For Android users, the "PSP version" is desirable because the PPSSPP emulator is extremely lightweight. It often runs smoother on low-end Android phones than Rockstar’s official (and somewhat bloated) native Android port.
Since San Andreas was not a real PSP game, you cannot find an official ISO. Instead, the community has created specific modded builds. When searching for the , you are looking for a fan project known as "GTA San Andreas 10th Anniversary Edition" converted for PSP or "GTA San Andreas Lite PSP." gta san andreas psp iso best download for android