Let’s say you’re setting up a lunch with a contractor, and you want to make it easy to call them when your iPhone alerts you to the meeting. Or perhaps you want to embed conference call details into an event. A little-known fact about the Calendar app is that you can enter phone numbers into the Location field, and when you’re viewing the event later, you can tap the number to dial it directly (if you need a real location in the Location field, use the Notes field for the phone number instead). To add a meeting code to a conference call number, append a semicolon, the meeting code, and the pound symbol—after the iPhone dials the phone number, you can press a button to dial the code at the right moment. The entire thing would look like 518-555-0101;123456#. For a more automated, but potentially error-prone approach, replace the semicolon with one or more commas, each of which causes the iPhone to pause for 2 seconds before dialing the rest of the numbers.
Want to add your Google (or other) Calendar to the iPad's Calendar app? No problem. In Settings open Mail, Contacts, Calendars. Add an account and tap on Other. Tap on Add CalDAV Account and enter your Google Account credentials (the Server is www.google.com). Exit the Settings app and tap on the Calendar app and all your events should appear. By default all calendars are displayed, but you can tap on the Calendars button to choose which ones are shown.