You shouldn't steal your friend's things.
Jack and his friend Hoffner are sitting in Hoffner's house and Hoffner has to go to the bathroom.
Jack wants to get a new phone.
Jack asks his friend Hoffner if he can borrow a bit of money for a phone down payment from the store and then rides to pick it up.
Jack decides to pocket Hoffner's phone while Hoffner is in the bathroom, so that he can upgrade from his old phone.
Jack and Hoffner each get new phones from the store as there is a buy one get one deal going on.
Hoffner contacts the police, and they track Jack through the phone tracker and arrest him.