Jimmy woke up to dozens of text messages claiming that he's been calling and texting people non-stop. Leo says that his number has been "spoofed," and the only thing he can do is wait until the spoofers move on to a new number. It's called "Neighbor Spam," and it's being used to get people to answer a local call. Eventually, enough people will block the phone number, and then they will move on to yet another number. Unfortunately, there's not much else he can do.
One thing that's coming is a process called "Stir and Shaken," where if we don't recognize a number, we just shake the phone and it goes away. Most cellular companies will likely adopt it in the coming years.