How To: Replace iPhone 3GS Housing Back Case - YouTube
South Korean Carrier Will Start Selling the iPhone 3GS Again - ExtremeTech
For iPhone 3G 3GS Housing with Frame 8GB 16GB 32GB Battery Door Housing Back Cover Case Mobile Phone White or Black|Mobile Phone Housings & Frames| - AliExpress
iPhone 3GS battery appears to have expanded. | MacRumors Forums
White Rear Back Cover Replacement Part For Apple iPhone 3GS White A1303 | eBay