I made some notes on the various uses of Niko's phone on GTA 4 for the PS3, so I hope these may be of help to you:
To use Niko's phone on GTA IV (for the PS3):
To activate phone: press upwards once on the directional pad. To access friends and saved numbers press "x" for Phonebook, and also for Options etc.
To dial a number, e.g. 911, cheat codes, etc., activate phone by pressing directional pad upwards twice, showing blank screen ready for number input. Choose numbers required by using directional pad, pressing "x" on chosen number. When all numbers on screen, press the telephone icon on the left hand side and number should ring.
To enter cheat codes:
Enter cheats during normal gameplay. Find the cheat you want to enter, activate Niko's cell phone and put in the numbers using the directional buttons. When the cheat is entered a message will be seen saying "Cheat Activated".
To block unwanted calls:
If you want to stop Niko's mobile phone receiving calls temporarily when you are still playing the game, you can go into the Options menu and find the Sleep Mode and disable the phone. When the Sleep Mode is functioning, a tiny telephone icon will appear to show that it is on. But, if the phone is in Sleep Mode, you have to remember that it can stop the mission flow, and you would have to unlock the Sleep Mode to continue in the game properly.
If any of the friends call and you are not ready to go out with them, accept the invitation to go out and then shortly afterwards call them back and Cancel Plans. That way they will accept the cancellation but it does not lose Niko any percentage of their friendship.
You get nikos phone when you start the first mission
there are a few you have to put them in your phone though
You Can't. Go Buy Grand theft Auto IV, That game has a workable Phone.
nope
No. Unless you Start a new Game.
Type in the Nico's phone 087745550973
yea there is go into your phone then it will say multiplayer then click it
You just have to type them in like normal to use them about 1-2 times and then they are automatically stored in your GTA phone.
you have to dial the number in on the cel phone yeah what that says
ya
u can use htem in multiplayer
No