Maybe he meant his portable house phone, his cordless. I have intercepted a few calls on mine. One was a guy calling a 900 number for them to call him back! I was talking to my Mom at the time!! She heard it all, his phone blasted me off the air, it was louder than mine. I wrote the guy's number down when I heard it, then called him and told him! It was a riot! I searched on the web for who the number was just to satisfy my curiousity, and it was registered to a woman!
No, I didn't wait for them to call back....
The article did say "cell phone" specifically, but hey, we can trust our media to get these facts right? No?
A cordless phone and/or baby monitor would be even more likley than an accidental cell phone call. I live waaaaay out in the country and once picked up my neighbors gearing up for their next baby - if you know what I mean - on my baby monitor reciever.