The Warm Phone Issue (jut my 2 pennies)

My question is; what exactly in installed in the space just below the ear speaker behind the screen? Which is the only area that gets noticeably (and for a new owner) worryingly warm. Is it the battery, memory, GPS antenna?
While I understand the any device that requires a decent amount of energy to function will heat up, it is still a bit disconcerting to have an iPhone get noticeably warm in some areas while using it after 20-30 minutes (irrelevant of the type of use). Specifically, the screen area just below the ear speaker extending about a thumb width down and from side edge to side edge, both the front screen and back plate. It's especially noticeable since the rest of the phone stays pretty cool.
Fair enough that it's nowhere near as bad as most laptops or many LCD screens and it cools off in just a moment after going into stand-by, and I wouldn't use the word "hot" to describe it, but definitely a noticeable increase in heat.
One other observation, the phone gets slightly warm when charging through my laptop, but doesn't when charging through the wall plug adapter, don't have any clue if that means anything. Just an observation.
Apple may want to look into adding a different "heat sink" design to future models to help dissipate the heat over a larger area of the back plate. And, ridge the back plate to increase surface area and have a less "slippery" surface. I don't think a fan is practical.

romanom wrote:
My question is; what exactly in installed in the space just below the ear speaker behind the screen? Which is the only area that gets noticeably (and for a new owner) worryingly warm. Is it the battery, memory, GPS antenna?
While I understand the any device that requires a decent amount of energy to function will heat up, it is still a bit disconcerting to have an iPhone get noticeably warm in some areas while using it after 20-30 minutes (irrelevant of the type of use). Specifically, the screen area just below the ear speaker extending about a thumb width down and from side edge to side edge, both the front screen and back plate. It's especially noticeable since the rest of the phone stays pretty cool.
Fair enough that it's nowhere near as bad as most laptops or many LCD screens and it cools off in just a moment after going into stand-by, and I wouldn't use the word "hot" to describe it, but definitely a noticeable increase in heat.
One other observation, the phone gets slightly warm when charging through my laptop, but doesn't when charging through the wall plug adapter, don't have any clue if that means anything. Just an observation.
Apple may want to look into adding a different "heat sink" design to future models to help dissipate the heat over a larger area of the back plate. And, ridge the back plate to increase surface area and have a less "slippery" surface. I don't think a fan is practical.
I notice that if I use my iPhone 3GS to listen to some music or watch videos, browse the net for a period of time, I do notice the back of the iPhone gets warm (but not hot). This is normal in my opinion. You have got to remember that the 3GS has a powerful processor which will produce some heat when put under load. If you were to touch the heat sink on a PC's processor you would notice that this gets warm too.

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