Books with title Sabrina, the Teenage Witch 36: Wake-up Call

Sabrina is thrilled when Salem tells her that her aunts are going to get her a cell phone. Then she discovers that Salem was playing a trick on her, so she checks her magic book and finds an offer for one, complete with service contract for a week's trial. But there's a catch. Every time Sabrina even slightly crosses the line between right and wrong, the phone rings. The contract can't be broken, whenever she tries to 'lose' the phone it finds its way back to her, and all that ringing is driving her crazy. It takes a while, but finally Sabrina gets the message.