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