While not an official application from the folks at Rockstar Games, GTA Radio is still a pretty cool application to check out if you're a fan of the radio stations that are in all the Grand Theft Auto games. This neat little application from Keshav Verma features all the radio stations for your to listen to from all the Grand Theft Auto Games which are Grand Theft Auto. GTA III, GTA Vice City, GTA Liberty City Stories, GTA Vice City Stories, GTA San Andreas and GTA IV.
You will be able to listen to any of the included radio stations while using other apps as they can play in the background. You can also listen to them in your card on your phone while you pretend to actually be in a Grand Theft Auto game. Just don't go running over people or committing any crimes like you can in a GTA game.
Some radio stations from Grand Theft Auto IV are missing and are going to be included in a future update. All the rest are there already though so you'll have plenty of tunes to listen to. Even better is that you can download GTA Radio off of the Google Play store for free.
Website Referenced: PocketGamer
Google Play Link: GTA Radio