If you are overly-paranoid about people touching and trying to use your iOS device when you leave it in a purse pocket, or even on a table when you turn your head or walk away, then a new jailbreak tweak dubbed yWatcher
by iOS developer why not could seriously come in handy for you.
With yWatcher, you can enable one of two modes – Alert Mode and Pocket Mode. With Alert Mode enabled, when you place your iOS device on a table or something flat and leave it unattended, if someone picks up your iOS device and attempts to unlock it, a loud and obnoxious alarm will go off. When you enable or disable the Alert Mode, you will get a pop-up HUD (Heads-up display), as shown above.
The other mode, dubbed Pocket Mode, will do something similar to Alert Mode, although it's intended for pockets. With the mode enabled, if you place your iPhone in a pocket or a purse where it's nice and dark, and someone tries to unlock your iOS device, a loud and obnoxious alarm will go off. Just like Alert Mode, if you enable or disable the mode, you will get a pop-up HUD, as shown below:
Both Alert Mode and Pocket Mode are enabled or disabled on demand by way of Activator action. But there's also a third Activator action, which must be set to turn the alarm off once it's triggered by an unwanted person. You can configure all of these Activator actions from the Activator preferences pane all the way at the bottom of the Activator preferences pane:
Because the tweak works from the Lock Screen, you must pick an Activator action that you can invoke from the Lock Screen for the tweak to be effective. So Home Screen gestures probably won't be as effective for this tweak. While you can set an Activator action for disabling the alarm, this is only for when you accidentally toggle the alarm, as it will be turned off automatically when you unlock your iOS device.
When you enable either Alert Mode or Pocket Mode, you will notice a new icon in your Status Bar to tell you what mode is enabled. An eyeball indicates that you're in Alert Mode, and a pocket indicates that you're in Pocket Mode. If you receive an incoming Phone Call or FaceTime call, the tweak is disabled automatically to prevent an annoying alarm from going off while you answer a call, so you will need to re-enable either of the two modes after you're finished on the phone.
Because both modes send out a loud and obnoxious tone, if you're close to your iPhone, but you have your head turned, you will be able to catch that nosy child, spouse, or family member that keeps going through your phone when you're not looking, and they'll be stuck like a deer in headlights.
If you'd like to give yWatcher a try for your specific needs, it's available in Cydia's BigBoss repository for just 99¢. The tweak does require iOS 7 to be installed.
iPhone 5 running iOS 7.0.6
You can watch our video review of yWatcher below: