We can use a special iPhone 4 case such as XShot or unique stand like Glif to apply a tripod on iPhone 4. But if you don’t want to take a tripod in your backpack, the tiltpod articulating iPhone base should be a better solution.
The tiltpod is an ultra portable articulating iPhone base designed by Clint Slone, Mike & Eric Strasser. As we can see from the images, the iPhone base features a compact design, the custom hole allows you to attach the iPhone base to your keychain with ease. Most importantly, you can easily snap it on your iPhone or iPhone 4S, and the quick-connect magnetic ball pivot that attaches to the base lets you to adjust the angle for hands-free movies, FaceTime and more, while the base securely keeps your device in place. Apart from that, the iPhone base is also compatible with some compact cameras.
At present, the designers of the articulating iPhone base are raising fund on Kickstarter. Pledge $15 will let you own a tiltpod. If you’re interested, jump to Kickstarter for more details.