If you jailbrake your iPhone you must change default password to prevent unauthorized access. Here is how to do it:

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1. Start Cydia
2. Install MobileTerminal
3. Start MobileTerminal
4. Type: “su root” (without quotes) and press return
5. Enter default password “alpine” (without quotes) and press return
6. Type “passwd root” (without quotes) and press return
7. Enter new password and press return
8. Confirm new password and press return