updated 06:50 pm EDT, Wed July 28, 2010
iOS said to be unusable on the iPhone 3G
Apple has begun investigating reports of problems running iOS 4 on the iPhone 3G. An Apple spokesperson told the Wall Street Journal that the company is aware of the complaints and is currently looking into the situation.
Many users have reported problems with excessive battery drain, heat, and overall performance. Although the new OS was expected to run a bit slower on the older hardware, even with multitasking disabled, some users claim iOS 4 effectively makes the iPhone 3G unusable in certain situations.
Apple has yet to provide a solution for the problems or advise against the upgrade for older iPhones.