Phone 55 is a mission in Grand Theft Auto 1 level 6, Rasta Blasta, given to the Protagonist by Brother Marcus. It is available from the payphone in west Vice Beach.
Mission
The mission begins with Brother Marcus revealing his plan to disrupt Babylon propaganda: the protagonist will need to head to northwest Felicity and destroy the Tanker which is driving around (despite being told it was a van). After blowing it up, the protagonist needs to go to the graveyard in southwest Little Bogota and steal an identical Tanker and take it the TV station in east Felicity. After it has been loaded up, it then needs to be taken to a garage in northwest Miramire where it will be unloaded by members of the Brethren. Once it has been dropped off, the protagonist then needs to go and collect another Tanker in west Little Bogota which needs to be taken to the nearest bomb shop (southeast Richman Heights). After a bomb has been fitted, it then needs to be taken to the building in west Vice Shores and detonated. Once the building has been destroyed, the mission is complete.
Reward
The player will be awarded 65,000 points and a +1 score multiplier for completing the mission.