Some users who purchased the latest version of Apple's iPhone report finding yellowish spots and bands marring the device's high-resolution display.
Several blogs, including TUAW and Gizmodo, reported user complaints of yellow discoloration on the phone's screen, which offers significantly higher resolution than screens on previous versions of the handset.
Pictures of the problem posted online by Gizmodo showed faintly yellow patches and bands crossing the screen.
An Apple spokeswoman could not immediately be reached for comment about the reported screen problems.
The iPhone 4 went on sale Thursday, starting in Japan. However, some users in the U.S. who preordered the new handset received their phones before retail sales started.
Sales of the iPhone 4 will also start today in Germany, France and the U.K.