Pause the game, and go to your cell phone. Dial any of the followingnumbers(including the "#" symbols). Then, go to the "Cheats" menu andenable the unlocked options:

WEAPON - NUMBER
12 Gauge - #920
44 Shepherd - #921
AR200 Machine Gun - #922
AR50 Assault Rifle - #923
AR50 Assault Rifle w/ Grenade Launcher - #924
AS14 Automatic Shotgun - #925
Baseball Bat - #926
Chainsaw - #927
Fire Extinguisher - #928
Flamethrower - #929
Flashbang - #930
GAL43 Uzi - #931
GDHC - #932
Grenade - #933
Holt 55 Automatic Pistol - #934
K6 Krukov - #935
Knife - #936
Machete - #937
McManus2010 - #938
Minigun - #939
Molotov - #940
Nightstick - #941
NR4 - #942
Pepper Spray - #943
Pimp Cane Shotgun - #944
Pimp Slap - #969
Pipe Bomb - #945
RPG - #946
RPG Annihilator - #947
Samurai Sword - #948
Satchel - #949
Shock Paddles (resurrect the dead) - #950
SKR-9 - #951
Sledgehammer - #952
Stungun - #953
T3K Urban - #954
Tire Iron - #955
Tombstone - #956
Vice 9 - #957
XS-2 Automatic Shotgun - #958