updated 07:45 pm EDT, Thu July 2, 2009
iPhone heat guidelines
Apple has provided a set of guidelines to help prevent users from overheating their iPhone 3G and 3GS handsets. Although the support page does not directly acknowledge the widespread reports of excessive heat with the new 3GS model, the company suggests the handsets should be operated in temperatures below 95℉ (35℃) and stored in areas that do not exceed 113℉ (45℃).
Along with the general temperature guidelines, Apple claims users may receive a warning message if certain applications are used or music is playing while the device is in direct sunlight.
Although the company suggests problems will only occur in hot climates or with direct sunlight, complaints from many iPhone 3GS owners have related to typical usage. Several pictures have surfaced of the white handsets with discoloration on the back panel, while others claim the device becomes too hot to be used comfortably during a call.
A number of users experiencing excessive overheating or case discoloration have contacted the company to test the affected devices or replace them under warranty. Apple has not yet disclosed any further plans to address the issues.