Choose the "Enter Game Cheat" selection at the "Options" menu. Activate the following cheats by entering the corresponding codes:

CHEAT FUNCTION - CHEAT CODE
10,000 money - IAMRICH
Super fast speed - HYPERSPEED
Get Hummer;
can only use it when you have a bike - GETHUMMER
Gets convertible - MYGIRLCAR
All jobs - THEEXPERT
Unlimited fuel - KRACE33
GPRS map;
access by selecting "Options",
then "Current Status", then "GPRS" - MAPON