Prank calls

It's been so long since anything odd or unexplained has happened around here that I got used to normal. Hmm, there's nothing like another scientific impossibility to set you right back to nuts, is there?
The weirdness started around 2 AM Saturday morning. The phone rang. It's horrible when the phone rings in the middle of the night, panic sets in even before you've answered it. And even if it's just a drunk dialing the wrong number, it takes ages for the body to calm down enough to go back to sleep.
I picked the phone up and the id reads: STEVEN. And then it stops before I have time to answer it. That's the id of my husband's cellphone, who I now notice isn't in the bed beside me. I thought he'd just gone downstairs to throw the cat out. But why would he be phoning me on his cell? Strange, and what's stranger is that cellphones don't work in this house, or even in the surrounding area.
So I'm thoroughly confused and run downstairs to find Steven with the house phone in his hand and a perplexed look on his face. "I answered the phone", he said, "but there was no-one there and when I checked the caller id, it was my cellphone calling".
I'm very practical, so my first thought was he'd lost his cell and someone had found it and pressed the "Home" button to locate its owner. But, as Steven pointed out, he'd phoned from his car on the way home Friday evening, and he hadn't been anywhere since, and the cell was still in his car. Uh, oh. My next thought was that the car had been stolen.
As Steven made his way to the garage, phone in hand, it rang again. The id was still STEVEN, and when he answered it again no-one was there. Freaky. The car was still in the garage and his phone was in there, not switched off but powered down. He switched it on and attempted to phone the home but, as normal, there was no signal. Then, and this is the weirdest thing of all, as he is standing there with both phones in his hand, the cell idle but not off, the home phone rings a third time: STEVEN. I grabbed the home phone out of his hand, not surprisingly no one was there. Steven switched his cell phone off. We made a hot drink and waited. After twenty minutes or so we decided it was safe to go back to bed, and that was it. No more unexplained calls from a cell phone that was off and doesn't get a signal here. Nothing, except on the call list on the home phone are three calls: 12/15 2:11, 2:14, 2:15 AM.
If ANYONE has any idea why or how this happened, please take a moment to let me know. Put me out of my misery. I'd just about got over the whole mystery automatic light thing (got over but not solved, since I thought I found the source of the problem the lights have come on by themselves a couple of times. But I've learnt that if I turn the exterior lights off first I can control the den lights. And it's all about control, isn't it?) but this phone thing brought a whole new meaning to bizarre phenomena.

And now I can't get the Animal song out of my head.