Tips to stop the iPhone overheating
In light of a spate of recent iPhone 3GS overheating reports, Apple published a set of guidelines to help iPhone users ensure that their devices remain at proper operating temperatures to prevent overheating and related issues.
More accurately, Apple released the tips the day that many of the initial reports surfaced, last Thursday, June 25, so it's unclear whether or not the two are connected — Apple has not issued an official comment on the reports.
But the following information could be valuable to any iPhone owner concerned with possible overheating.
From Apple: