An Easy Way to Increase the Security of Your iPhone in iOS 9
Ever since the iPhone was released in 2007, Apple has had a four digit passcode as a default. But with forthcoming iOS releases, Apple introduced characters and letters if users wanted to take advantage of a little extra security.
With iOS 9, Apple has added a six digit passcode as an option for those who want a little better peace of mind but don’t want the hassle of using letters and characters in their passcode.
1. Go to Settings.
2. Tap on Passcode.