Literally just smacked my forehead. THAT NEVER EVEN OCCURRED TO ME. What the hell is wrong with me?
Still, though, I think I'd rather a cell phone. What if there's a problem with him getting into the house? our neighbors all work.
Get the landline. 911 can trace calls from landlines ALWAYS, and much faster than they can from cell phones. Get a rock you can hide a key in, or something like that.