11. Know What Your iPhone Knows About You
Have you ever checked out the “Frequent Locations” on your iPhone? It’s amazing (and kind of scary)! Your iPhone knows where you hang out the most and is prepared to reveal these locations any time.
12. Never Use Passcode “1234” Again!
Even amateur hackers make cracking a 4-digit password look like child’s play. That’s why Apple makes it easy to create a password that’s more complex.
Click Settings > General > Passcode Lock to turn off the simple passcode — then enter something that’s harder to figure