If you've ever looked at the night sky and wished you had paid more attention in science class, then you should download Sky Map (formerly Google Sky Map) or SkyView for iOS or Android. With these apps you can point your phone's camera at a star or constellation and the app will tell you what you're looking at. They even work during the day to show you the position of the stars you can't see.
If you have an old phone lying around you can use it for home security. Taylor Martin explains the details in his article on how to turn your old phone into a home security camera you can watch from anywhere.
Write down your Wi-Fi name and password, take a photo and keep it in your gallery. When people come for a visit you can easily text them the photo.
Install a scanner app on your phone that uses your camera to scan your business cards, analyzes the information and stores it in your contacts for you. Here's an article with some good scanner apps to try.
Need to help your kid with some math homework, but you've forgotten everything you learned in math class? Download Photomath and take a photo of the equation. The app will take you through the process of solving the equation step by step and give you the answer.
The MTailor app uses your phone's camera to measure your body so you don't have to -- useful for clothes shopping. All you do is stand in front of your phone. The maker claims the app is 20 percent more accurate than a tailor. As of right now, the app is just for men.
BodyRecog is another app that measures your body using your camera. Once the measurements are taken, it gives you health recommendations based on the data it collects.
Open a new notebook or page in OneNote or Evernote and start a visual favorites list of certain brands you want to remember. For example, when you find a wine or beer you like, snap a photo of the label and save it in your favorites list. The next time you head to the store, you'll know exactly what brand tickled your fancy. No more standing in an aisle, scratching your head for 10 minutes while you try to remember that beer you discovered at your brother's cookout last week.
Install Google Goggles and you can find information about just about anything with a click of your camera. Simply take a photo of something you want to know more about and the app will search for information about the object. You can also use the app to cheat at Sudoku.
Take a photo of your foundation, blush and lipstick labels so you'll always know what shade to pick up at the store without having to memorize names or numbers.
You can use your phone's camera to play augmented-reality games. For example, Pokemon Go lets you feel like you're hunting for Pokemon in the real world. Ingress is an augmented-reality game that has been downloaded over 8 million times and Zombies Everywhere! lets you battle zombies in your neighborhood.
Write down what you are allergic to, what medications you take and your emergency contact information. Take a photo of the information. Then, make the photo your phone's lockscreen photo in case someone needs your information and you're unable to speak or incapacitated in some way.
Take photos of all of your credit cards, your car's license plate and your car's VIN number. Now, if your wallet or car is stolen, you'll have all the information you need to report it to the credit card company or police. Store these photos in a locker app like Folder Lock or AppLock to keep them safe from scammers.