I have no problem with people talking on their cell phones. However, I feel there are certain places where that should be avoided. Namely, public restrooms.
If you don’t mind subjecting the person on the other end to the sound of you peeing, that’s your business. But I certainly didn’t give you my permission to let them hear me do my, uh, business.
Bathrooms echo. Just wait a few minutes and call them back. Trust me, your conversation won’t suffer that much. And you eliminate the risk of your phone being “accidentally” flushed down a toilet.