"Put on your longest pair of rubber gloves and grab it," says TOH plumbing and heating contractor Richard Trethewey.
If it gets stuck, a plunger can make the problem worse. "The pipe gets narrower inside the trap, and if the phone gets wedged, it's going to be a bear to get out," Richard says.
If all else fails, a plumber may be able to hook it on the end of a snake. Once you've retrieved the phone, remove the battery and SIM card, dry them with a paper towel, and, if it's worth the $100 it will cost you, take the phone to an electronics repair shop, where they can open it up and dry the components inside.
How to keep this from happening to you: Lest you feel like a fool, nearly a third of the 20 phones fixed each day at Cell Phone Repair, in San Antonio, Texas, are suffering from the ill effects of a spin in the loo, says head technician Noel Flores.
His advice: Don't multitask. That way, you won't lose your new iPhone. (Or offend your friends.)