Phone 3 is a mission in Grand Theft Auto 1 level 1, Gangsta Bang, given to The Protagonist by Robert Seragliano. The mission is available from the third phone (from the left) in South Park in Liberty City.
The mission starts out with the protagonist being ordered to pick up a Tanker loaded with explosives in south Nixon Island in order to kill the new police chief who wants a bigger cut. The protagonist then drives the Tanker to the the police precinct in south No Law. When the Protagonist gets there, the protagonist drives under the building and positions it in the middle. The protagonist escapes the Tanker to avoid the explosion.
The protagonist then is told to follow Sonetti's lawyer to where he meets his gang in east Hackenslash, then kill the lot of them and leave no survivors. Once they are all dead the mission is complete.
The player is awarded 110,000 points (110,000 x Score Multiplier) and a +1 increase of score multiplier for successfully completing the mission.