Don't worry about data snoops. It's easy to lock your iOS device. Here's how.
First set up the code to lock your iOS device. Go to Settings >> General. Tap on Passcode Lock.
Tap Turn Passcode On.
Enter in a four-digit numerical code--twice.
And you've got a lock code. The passcode keeps all lurkers away. Just don't forget it!
Keep it private, too.
Now your iPhone is safe from prying eyes.