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How To Enter GTA 4 Cheats for Xbox , PS3 & PC. Differently from the button-input method of previous games cheat codes, the GTA 4 cheats are entered by dialing phone numbers on Niko's phone. Bring up your in-game phone by pressing UP on the d-pad or keyboard; Press UP again to bring up the dial pad; Enter GTA 4 cheat codes by "calling" the corresponding phone .