Once you have learned how to open an iPhone case you will be able to perform general maintenance or perform a repair. To perform a repair you will need to remove the additional five screws and continue to disassemble the iPhone main board. If you are simply replacing the camera or battery you will not need to open the iPhone any further.
- Cleaning - When cleaning the internals avoid harsh chemicals. Use only contact cleaner or compressed air to clean the internals. Exercise caution with compressed air as it may blow ribbon cables or connectors loose.
If you have lost the iPhone screws when learning how to open an iPhone case you can purchase replacements online. They are hard to find and one source to purchase them is SW-Box. They have a current cost of US $3.13.
For more details on cleaning the iPhone read this article on How To Clean The iPhone.
Screenshot courtesy of ZDnet.