Add "used engine oil" to the list of things that cell phones can't tolerate.
We all know, by personal experience or the experiences of others, that cell phones don't like water. It doesn't matter if the water is in a toilet, a cattle waterer, or the live well in a fishing boat--cell phones have no sense of humor about being immersed in H2O. I've heard they also don't like liquid hog manure, a full rate of Treflan, or Texas-style chili.
Today my cell phone took a dive into a 5-gallon bucket full of used engine oil. The only bucket within 50 feet, but it managed to find it. It was quickly rescued and thoroughly rinsed with electric contact cleaner, and for a while there was hope I'd be able to resuscitate it. I was eventually able to dial and make calls, and it would ring and accept calls. I could hear the person talking on the other end. But I was never able to resurrect the microphone. So now I can listen on the phone, but nobody can hear me if I talk.
My wife thinks my "new" phone is wonderful.