See How Bill Teardown Apple's iPod Touch 4th Generation (2010)

See the work of Bill Detwiler, who Teardown a brand new 4th Generation iPhone / iPod which was released on 2010. We all know iPhone is such a device which come with compact casing. Even the battery of device can't remove from it. 

As with the iPod Shuffle and Nano, the Touch isn't designed to be easily disassembled. In fact, I found it to be the most difficult to take apart.

To disassemble the iPod Touch, you'll need a Phillips #00 screwdriver, a thin metal blade, plastic spudger, or iPod case opening tool, and a hair dryer or heat gun. -- 

Click here to see the series of picture (about 65 image) from a full functional device to part it as small as possible.