While originally for PC, community-made ports have brought versions of this mod to Android . Summary of the GTAModMafia Blog Entry

Replaces the standard San Andreas state (Los Santos, San Fierro, Las Venturas) with full versions of Liberty City and Vice City.

Includes fixed rooftops, new usable garages, shops, and hundreds of accessible interiors that weren't in the original standalone games.

Existing San Andreas or older GTA United save games are not compatible and will cause crashes; a fresh start is required.

is a massive "total conversion" modification for GTA San Andreas on PC. Its primary goal is to merge the maps of GTA III (Liberty City) and GTA Vice City into a single game environment using the more advanced San Andreas graphics and physics engine.

According to the Official Support Page and community guides:

As of July 2021, the original developers officially took down the mod from their main site due to potential DMCA legal concerns, though it remains available on various third-party community sites like GTAModMafia . Key Features

Must be installed on a 100% clean, unmodified version of GTA San Andreas.