You're right, they can, and if someone else had been present I would have asked them to without anyone having to suggest it. But I wasn't about to wake up my friends or family at 10:30pm just to ask them to call me to test if my phone rings so I wouldn't have to wait overnight to verify. I'm sorry I didn't include that level of detail -- I'd thought it was covered by "if you have another phone". Was that really deserving of a personal attack?