How the scam works is as follows: Users who download the game will get to a certain point in the installation where it says it cannot be completed until a survey is completed and a confirmation code is sent. In order to receive that code, you need to provide a valid mobile number and to send a text to a certain number provided.
With your number, the scammers sign you up for a premium service that charges your mobile bill daily until the service is cancelled.
While you are being scammed on your mobile bill, the installation finishes, installing the well-known malware, Trojan.GenericKDV.1134859 to your PC and leaving you with a pirated copy of the game 'The Cave.'
As stated, stay away from any current torrents of the GTA V game.
They've tried the same scheme with Diablo 3 and the new Simcity. Bloody underhanded.