iPhone repair shops have all of the details about iPhone problems first hand. Regular telephones are relatively inexpensive and to replace. However, replacing a broken iPhone is just too expensive to consider. Millions of new iPhones have been sold all over the world and as a result someday you may need to replace your iPhone's glass.
Owners are constantly causing physical damage to their iPhones. They also lack the understanding of how to open and repair an iPhone. As a result there are numerous do it yourself repair videos out there. There are numerous people who aren't repair experts will try to open the iPhone 3G in the same way as the iPhone 2G. By doing so they are making a simple iPhone glass replacement job into a more expensive repair. There are only 2 small screws that have to be removed from the docking port in order to open the iPhone 3G. By placing a suction cup by the home button area, you can lift the glass away from the iPhone.
After this is done, you can proceed with your iPhone glass replacement on your iPhone 3G.
When you are servicing the 3GS phones, you should now that it opens like a 3G iPhone. Doing other repairs and replacement on the 3GS iPhone is also the same as on the 3G iPhone. The 3G parts aren't the same as the 3GS parts. While the main parts of the 3G and 3GS look similar, they have different connectors.
There are many self repair iPhone owners who don't realize that finding a supplier for parts can be very difficult. It also takes some time to get the parts for your iPhone when it breaks. For this reason, you should find a good supplier in your country for 3GS, 3G, and 2G parts.