While early iPhone 3G adopters reported that their new phone’s display is much warmer, or yellow-tinted, compared to the displays of the original iPhone. Apple gone on record to say that the tint is a deliberate choice to improve overall usability.

Although clicking “Check for Updates” in iTunes continues to reveal no new firmware, touching “Restore” installs firmware two builds newer than what was loaded on to the new iPhones in the factory, bumping them from 5A345 to 5A347. Many of those claim the lengthy process brings iPhone 3G's color point back to a more neutral position, eliminating the tint altogether.

Source:→ AppleInsider