There are two types of passcodes available: simple and complex. A simple passcode is restricted to four numbers, while a complex passcode can be longer and include letters. For a little extra security, use a special character.
You can access special characters on your iPhone's keyboard by pressing and holding on certain keys. For example, tap and hold I, O, U, E or C for a pop-up menu of available special characters. To choose one, simply slide your finger over it and release. Now, here's how to use them with a passcode.
- Tap Settings, General and then Passcode Lock.
- Move the Simple Passcode slider to the Off position.
- Tap Turn Passcode On and create a passcode, using the special characters as described above.