Tip One: Move toward the light
Any camera film, DSLR, or phone all do the same thing - capture light. When you have good light, you'll have good photos. If you're capturing something that can be moved, try to arrange it so that the light flatters your subject. If you're shooting at night, the onboard flash may do the trick - but I recommend looking for a light in the area as long as your subject is movable. Overhead lighting or street lamps can work great at night for getting the better images. Just try to find some flattering light and move towards it.
Tip Two: The in App camera is not your friend
Don't use the camera in an app, use the camera icon on your phone. The in app camera will downgrade the resolution of your images. When you use the camera icon on your phone for your photos you'll be able to adjust lighting and contrast as you capture providing you better images.
Tip Three: Forward facing camera is bad
Don't use the forward facing camera. The forward facing camera uses less pixels than the rear facing camera and you'll notice a compression issue as well. If you're trying to get a great selfie of your new outfit or hair style, use a mirror and the forward facing camera. You'll get a better looking photo with less "noise" or digital distortion. If you've got an iPhone you can use the "handicap" option that will allow you to set the phone down and capture an image hands free, it works just like a timer.
Tip Four: Cleanliness
make sure you don't have any obstructions on your lens. If you're like me your phone is in your purse, pocket, table, desk, everywhere and it gets pretty dirty pretty fast. Just a simple quick wipe before you go to snap your pictures will ensure a better capture!
Tip Five: Hold still!
This doesn't apply necessarily to your subject as much as it is does to you. Much like any other camera you may use, any shaking while holding the device will create some blur to your images. Try to hold the camera steadily while you shoot away.
Tip Six: No Zoom
Don't zoom in before you snap. Wait to crop the image. Once you zoom on a cell phone camera you're degrading the quality of your final image. While it's an option, it's not going to help you capture a masterpiece. Try using an editing app to zoom in on your subject after you've captured.
Please let me know if you've got any tips for mobile photography of your own! Happy shooting!