A year or so ago when I got my new phone, we just kept my old phone, added a line, and relabeled it the "family phone." One of the primary reasons we added another phone was so the kids would have a way to get in touch with us when they are home without us. Today Zach and I went for a walk. The kids were all home together. We told them to call or text if they needed anything while we were gone. We hadn't made it to the end of the block when we got a text from the family phone. It read "Briggs is being obnoxious and bothering us."
Long distance tattling. Maybe not exactly what we had in mind.