 While free roaming the game world , players may engage in context @-@ specific activities such as scuba diving underwater or BASE jumping via parachute . Each character has a smartphone for contacting friends , starting activities and accessing an in @-@ game Internet . The Internet lets players trade in stocks via a stock market . Players may purchase properties such as homes and businesses , upgrade the weapons and vehicles in each character 's arsenal , and customise their appearance by purchasing outfits , haircuts , tattoos and jewellery . 
