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Learn how to set passcode on your iPhone 4.

To protect the privacy of your data on iPhone, you can set a passcode as a key that only you know to unlock your iPhone by following 4 steps below:

1. Go to Settings

2. Choose General

3. Tap on Passcode Lock then insert a 4-digit passcode

4. Retype the passcode to confirm

From now on, anyone who wants to access your data on iPhone has to get the passcode right first. Moreover, you can enhance this function by using longer passcode with numbers, letters, punctuation and other special characters.