As long-time iPhone owners, it’s easy to assume that we know everything there is to know about the Phone application’s dialer — but as we found out this past week at CES, there’s always something more to learn. While tapping on a contact with an international number is a relatively simple affair—at least, until it comes time to decipher your phone bill—manually dialing a number can present a challenge for those of us who aren’t used to it. The key to the process, as it turns out, is adding the “+” symbol to the beginning of the number, which you can do by tapping and holding the “0” key. Once that’s done, enter the country code and number as usual, and the iPhone should automatically sort through the numbers so that you’re not accidentally dialing area code 45X when you’re really trying to reach Denmark.