The Simpsons Season 20 Episode 2 (10/05/08)
When Bart is tired of not having a cellphone, he tries to work in a country club as a golf ball finder so he can get paid but Groundskeeper Willie took all of the golf balls he found. While working at the country club, Bart sees Denis Leary throw his phone away and he picks it up. Bart uses this opportunity to go on a prank-calling spree until Marge finds out what he's been up to and contacts Leary. Leary lets Bart keep the phone, but also turns it into a tracking device for Marge to keep tabs on Bart.