The button is given below which you have to press to open the Phone in GTA 4 PC game. once you open the phone you can use the phone according to your need.
Steps to open Phone, Close Phone
- Press the Up arrow button to open the phone, then Press the Up arrow again to open the dial pad.
- you can Press Backspace or Right click on the mouse for Back/for the closing phone. (Note: You may have to press multiple times for going back and for closing the phone.
- Now for entering cheat codes in the form of numbers, you have to open dial pad, after opening dial pad you can enter cheats in the phone. (Note: Press arrow keys for moving the highlighter and Press Enter for pressing numbers)
- After writing all numbers, press the enter key to dial the number.