If you meant to type "Phineas" as in the cartoon show "Phineas and Ferb", he is voiced by Vincent Martella.
If you mean Isabella, then the voice of Isabella is Alyson Stoner.
Bobby Gaylor voices Buford. He was one of the writers on Phineas and Ferb first season and he was the visual inspiration for the character Bobby Fabulous in the Love Handel episode. He also voices "Stanky Dog" in the Beach episode.
2007
Rob Tinkler plays the voice of Ginga Hagane, the beyblader.
Minami Takayama she also plays the voice of Ursula.
Thomas Sangster
Maulik Pancholy.
Mitchel Musso plays Jeremy
If you mean Isabella, then the voice of Isabella is Alyson Stoner.
The voice for Jenny in Phineas and Ferb is Alyson Stoner.
The voice of Dad in Phineas and Ferb is Richard O'Brien.
Dee Bradly Baker
Thomas Sangster
Thomas Sangster plays Ferb.
Bobby Gaylor voices Buford. He was one of the writers on Phineas and Ferb first season and he was the visual inspiration for the character Bobby Fabulous in the Love Handel episode. He also voices "Stanky Dog" in the Beach episode.
2007
Steve Staley, he plays his voice.