To put on the crystal case, simply hold the back plate against your iPhone 4S, slide the frame over and click the pieces into place. But according to the source, you have to bend and lift the bottom over the top inseated of sliding the bottom portion of the frame into the top which isnt easy. The crystal case comes with a screen protector , logo stickers and lens stickers. You are going to experience no problems with the earphones or ports but might face difficulty while docking your iPhone. Most people buy these cases to prevent damage from drops and crystal cases just like color cases are unlikely to resolve the problem
You can get them for around $25. But those who drop their iPhones now and then must keep in mind that these cases won’t extend the life of their iPhones.