Film Dope

Bart is embarrassed at not having a cell phone after he realises all of his friends have one. But as luck would have it he finds one on a golf course which has been thrown away in anger by actor Denis Leary. As Bart takes new ownership of the item, he learns that his parents are tracking his every move via the chip inside the phone, so he removes it and ties it to a bird, which leads the family on a wild goose chase to find him and bring him home.

See Simpsons wiki for more details.