Siri is proving to be an indispensable tool for some iPhone 4S owners, providing a powerful spoken interface for common tasks—but sometimes to utilize that power, you have to watch what you say. Like, for instance, when you’re trying to create an undated reminder with Siri. If you ask it to remind you of something, the entry will have a date, and possibly a place or time—since it’s commonly used with phrases like “when…
