1: Make iPhone a Flashlight
There have long been third party apps that use the cameras flash to enable a flashlight on the iPhone, but now this surprisingly useful feature is finally built into iOS. Accessible from just about anywhere via a swipe up to Control Center, this is one of those features that once you start using you simply can’t live without:
This may sound like a funny claim, but Flashlight may be one of the single most useful features added to iOS 7. Left your porch light off? No more fiddling in the dark to find the doorknob. Parked in the corner of a dark parking garage? No sweat. Walking the dog a little too close to sunset, and realized you’ll be out past dark? You already have a flashlight with you just by bringing your iPhone.
Leaving the Flashlight turned on seems to drain the battery at about 0.5% to 1% per minute, meaning you’ll have more than enough time for most common usage situations, but you wouldn’t want to rely on it for some extended spelunking journey within Carlsbad Caverns.
I use the Flashlight constantly since it has been bundled as part of Control Center, and I can pretty much guarantee that once you start using it you will too. If you happened to have turned off Control Center use from apps, be sure to leave Control Center access turned on from the Lock Screen to get the most use out of this. Really, the Flashlight is a incredibly helpful feature, and it should really be considered another wonderful usability addition.
2: Use iPhone as a Digital Level
The Compass app doubles as a digital level, which means you’ll never need to hang an uneven picture frame again, or have an off-kilter pingpong table. Plenty of us geekier folk know about this feature, but just about nobody else seems to. All you need to do is launch the Compass app, then swipe to the left to bring up the level feature. The level color turns green when the item is flat at 0°.
Turning the iPhone onto it’s side enables the level, excellent for hanging pictures on the wall and making sure something is set just right:
Setting the iPhone on it’s back switches to the plane level, which is useful for making sure things are flat, like a dining table or pool table. :
The level has proven very accurate throughout personal experience, though there are some mixed reports that certain iPhone 5S models have inaccuracies with it’s functionality. If that’s true, it’ll likely be resolved through an upcoming iOS software update.
3: iPhone as a Digital Compass
Admittedly, this is going to be less useful for the average user, but your iPhone takes the Boy Scout motto of “be prepared” fairly seriously and gives you a digital compass to help point you in the proper direction:
Compass will also provide your precise current location through GPS coordinates, should you need them for emergency purposes, or just for fun.
Many of the Compass features are also built directly into both Apple Maps and Google Maps, but the mapping apps tend to drain battery a bit faster, which could give Compass some advantages. source