there is no phone in gta3 you can use. you must be thinking of gta4. press up 2 times on the d-pad.
If you are on Xbox 360, you can dial numbers and cheat codes by pressing up once on the D-Pad to open the phone, and another time to launch the keypad. Then, you just use it to dial in numbers.
Almost everything in GTA4 revolves around your cell phone. All of the cheat codes do too. If you pull out your phone and hit up twice, then dial the numbers onto the phone you get hooked up with whatever cheat it represents.
use your fingernail. i know that you can get water out of a phone by using un-cooked rice (it works, ive been there) so that might help
A pear pad
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Press up on the d=pad (directional pad)
Up on the D-Pad
Press up on the d-pad to bring up the phone and press a (xbox 360) or x (playstation) to accsess phonebook, camera, e.t.c. Press up again to accsess the key pad and press a or x to punch in a number and left or right to change numbers.
Either the key pad on the drivers' door, the remote, or use the key.
nowhere, but if you use your phone by pressing up on the dpad, and press the x/a button, you should be able to scroll to multiplayer!
You use the arrow on the key pad to move