There are many open-world games like GTA 5 available on mobile for free

Gangstar Vegas: World of Crime is a multiplayer open-world role-playing game

The game is absolutely free to download on Playstore and app store

It has over 100 Million + downloads on Playstore alone

It has a 4.3 out of 5 rating from 6.4 Million users on Playstore

Gangstar New Orleans is the largest open-world game released on mobile

It is available to download for free on Android, IOS, and windows

It has over 10 Million+ downloads and 4.4 out of 5 rating from 800k users

Gangstar Rio: City of Saints is an open world single player story mode game

Developed by Gameloft and released on November 7, 2011

It is available on both Android and IOS for 6.99$ only

It has over 100k+ downloads and 4.4 out of 5 rating