1: Make sure firmware is up to date

2: Disable Wi-Fi when not in use

3: Disallow automatic association to networks

4: Turn Bluetooth off when not being used

5: Disable location services until needed

6: Set a passcode

7: Erase data if too many wrong passcodes are entered

8: Erase data before returning or repairing the iPhone

9: Disable SMS preview

10: Disable JavaScript and plug-ins in Safari

via techrepublic

pic via maclife