The timeline of the iPhone design
iPhone 4 (Fourth generation)
Launched: June 2010

After the disappointment of the 3GS, the iPhone 4 was welcomed featuring a new flat design with an integrated antenna (although depending on how the owner held their phone, it caused issues), a high-resolution Retina display (640 x 960 pixels) and a 5MP camera (featuring HD video recording), on top of internal performance improvements.
By 2010, Apple’s competitors were seriously catching up so Apple’s response was powerful with the iPhone 4.
Image provided by WikiCommons
