Phone 31 is a mission in Grand Theft Auto 1 level 5, Bent Cop Blues, given to the Protagonist by Samuel Deever. It is available from the third phone (bottom left) in southwest Vice Shores.
Mission
The mission begins with Deever informing the protagonist that some punk is pulling a bank job without asking Deever's permission. The protagonist must go to southeast Banana Grove, steal the guy's red Brigham and then go and collect him from the bank in northwest Richman Heights. After collecting him, he must be taken to the garage in central Banana Grove, whilst avoiding the police, to complete the mission.
Tip
The less risky way to complete the mission is to trigger a Kill Frenzy before collecting the bank robber (preferably the one with rocket launcher in Southwest Felicity). Having a high enough multiplier, the Kill Frenzy is completed as soon as the robber is picked up, so the protagonist can avoid getting any wanted level.
Reward
The player is awarded 45,000 points and a +1 score multiplier for completing the mission.
Video Strategy
Grand Theft Auto 1 PC Vice City Chapter 1 - Mission 7