This is just silly, it is nearly impossible to find multiplayer in Grand Theft Auto because getting there is actually in the game.
To jump into a multiplayer match, you need to have the cellphone. (The cell, however, is given to you very early in the storyline, so this shouldn’t be a problem.) To jump into multiplayer, do the following:
1. Bring up your mobile phone.
2. Access the cellphone menu.
3. Scroll down to Multiplayer.
4. Enter the Multiplayer submenu, at which point you can access multiplayer matches, customize your character or view a multiplayer tutorial.