The iPhone 3GS is a smartphone that was designed and marketed by Apple Inc. It is the third generation iPhone, successor to the iPhone 3G. It was introduced. SAN FRANCISCO—June 8, 2009—Apple® today introduced the new iPhone™ 3GS, the fastest, most powerful iPhone yet, packed with incredible new features. CUPERTINO, California—July 14, 2008—Apple® today announced it sold its one millionth iPhone™ 3G on Sunday, just three days after its launch on Friday.