“Apple is investigating reports that the latest iPhone operating system causes problems for users of the iPhone 3G, after a series of complaints on Apple support forums and technology blogs. Apple is aware of the reports and is looking into the matter, a spokeswoman told Digits,” Jennifer Valentino-DeVries reports for The Wall Street Journal’s “Digits” blog.

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“Since the iOS 4 software became available in late June, user concerns have surfaced on Apple forums,” Valentino-DeVries reports. “The most common criticism is that the phone is slow after an upgrade. There are also many complaints that the phone drains the battery quickly and becomes excessively hot.”

Valentino-DeVries reports, “Apple’s latest iPhone operating system is powerful, and the iPhone 3G is two years old at this point. The new operating system isn’t compatible at all with the earliest version of the iPhone — but it is supposed to be compatible with the 3G and 3GS, although some features, like multitasking, won’t work on the 3G.”

Read more in the full article here.

[Thanks to MacDailyNews Reader "JES42" for the heads up.]