Phil Cassidy's missions become available after completion of The Malibu Club mission, "The Shootist". His missions count as an Asset, but they are off-track from the main storyline, and do not need to be completed for advancement in the storyline. He has two missions in total.
Gun Runner
Tommy is told to run by Phil when he arrives, escaping an explosion from Phil's toxic home brew, Boomshine. After that facade, Tommy asks how he can get a hold of guns. Phil tells him that a rival of his in the gun-running trade is doing his rounds today, and that will allow Tommy to get a hold of weapons AND help Phil whilst he's at it.
There are four Walton pick-up trucks that are carrying crates of guns. They travel in two pairs, and when you alert them, back-up will arrive in the form of thugs on Faggios. Killing these thugs give you a $100 bonus for each kill. You are better off knocking the crates off the back of the trucks, before destroying them. Your job after taking the four weapons - an Uzi, an M60, a Combat Shotgun and a .357 Equalizer - is to destroy the Walton trucks. If you have done that prior to collection, the mission is completed. If you haven't, they will pursue you and you will have to do it then.
Mission Passed: $2,000
Boomshine Saigon
A drunken Phil greets Tommy, and tries to show off his explosives. However, when he attempts to set them off, the batteries in his detonator have gone dead. He stands right next to the explosives, changes the batteries, and rather stupidly sets them off. He blows off his right arm, and now the whole thing is now literally blown out of proportion.
You have to drop Phil off at the hospital before he dies. The camera is simulating Tommy's drunkeness due to the fumes of Boomshine. You have to take him to the health center nearby, before his paranoia takes over, and asks to be dropped at an ex-Army infirmary doctor and buddy of his, who has a surgery in Little Havana. When you have dropped him off, the mission is completed.
You are able to buy heavy weaponry from Phil's Place. You can buy Remote Grenades for $1,000, a MiniGun for $10,000, an RPG Launcher for $8,000, and an M60 for $8,000.
Mission Passed: $4,000