If you regularly dial into conference bridges you'll love this tip. Conference bridges are services that you dial into and then enter a numerical code to connect to your conference call. Today I learned that you can put the conference line's phone number and the access code for your call into the location field of your calendar event, separate the two with a semi-colon, and iOS handles it smartly.
When you tap the phone number to dial it from the iOS meeting, it carries over the access code as well. When it's time to enter your code, you just tap the "Dial xxxxx" in the lower left corner of the Phone screen. I don't know when they added this functionality to iOS, but I'm a fan.