Phyllis is the wife of Giorgio, a random character in GTA: Chinatown Wars. Her husband is suspecting that she is cheating with other men, with the help of Huang, Giorgio has Huang put a bug on her car to track her. After which it is discovered that she is a prostitute. Despite this Giorgio complains that he hasn't had sex in three months, and after kicking a man out of her car, pays her $20 dollars for sex.
Phyllis also appears on posters in GTA IV. The posters can be found in strip clubs as well as the Hove Beach sex shop.