There are a variety of different cases, ranging from pretty inexpensive to very expensive. Griffin is one of the more popular brands, with a variety of styles that range from about $20-$50. Hardcandy makes a fairly well reviewed case, and Otterbox is popular for many smart phones. Some other well reviewed brands include Scosche, Proporta, and Speck.
The toughest iPhone cases are clip-on cases made of heavy synthetic rubbers or other flexible plastics. Leather cases can be durable if well made, but vinyl cases do not last well.
Apple makes a standard case for the iPod 4g. Check out apple.com or go into your local Apple store. You will find a wide variety of colors to choose from.
The iPhone works very well with Apple's standard case, but most any iPhone case will do.
best iphone 4s cases
cool iphone 4 cases
I want to suggest Gadgetzkart as the best iPhone case at affordable prices. They provide the best quality iPhone case that helps to protect your iPhone from all sides. They have a lot of collections of iPhone cases in different designs and colors.
My favourite brand of iPhone case is Safe Sleeve. They make stylish, protective cases that also protect you from any radiation your phone my emit. I love mine and couldn't recommend it more!
Droid
It depends on what you want. There are many different kinds of iPhone 4 cases such as designer cases, luxury swarovski crystal cases, artist hand-painted cases.
Twitter works great on the iPhone. There are plenty of free apps to try out from the app store, find which works best for you.
You can find cute iPhone 5c cases in stores like Walmart, Best Buy and online at Amazon.
Cases for an Iphone 5 can be bought from Future Shop, Best Buy, Best Byte, Henry's, Walmart, Target, Staples, Grand & toy, Walgreens, Sears and The Bay.
This is hugely subjective. Some answers from contributors include:Cath Kidston case for Apple iPhone 4Designer iphone 4 cases,shining Swarovski crystal cases
iPhone cases are available in most stores which sell electronics such as Radio Shack, Best Buy, Target, Walmart, and others. iPhone cases are specific to the model of phone you own so be sure to check for compatibility.