How do you call people on grand theft auto IV?

I really need to know how to call people on grand theft auto IV for playstation 3.

Please help us.

Because we want to enter a cheat but we do not know how.

Please %26amp; thank u(:How do you call people on grand theft auto IV?
Play through the first mission so you get your cell phone. Then hit up twice to access your cell phone's keypad.How do you call people on grand theft auto IV?
you first have to beat the mission where roman gives you a phone. then you press up on the d-pad twice. then choose your numbersHow do you call people on grand theft auto IV?
Hit up twice to access you keyboard
use your phone