Existing users, 
Feel the heat: iPhone users report uncomfortable temps; keeping it cool
Posted 6 July 2007 @ 10am in Troubleshooting
Excessive heat and compact digital devices aren’t strangers to each other; PDAs, cell phones and other portables often dissipate significant amounts of heat from their exteriors, sometimes causing discomfort for the handler.
The iPhone is no exception, with a number of users reporting uncomfortable heat generated by the device under some circumstances. More disconcerting, however, are reports that if the unit gets too hot, erratic behavior can ensue and the potential for component damage surfaces.
We’ve analyzed a series of reader reports and inferred the following:
When the iPhone gets extremely hot
- While charging
- When being used while charging
- While using Wi-Fi while on phone calls
- On very long phone calls (typical for most mobile phones)
In essence, it looks like performing multiple functions simultaneously on the iPhone (charging and talking on the phone or accessing data services; accessing data services and talking on the phone) can cause internal and ambient temperature to spike.
How to cool it off
- Ditch the case: Some cases, especially those designed before the iPhone was released an not properly tested with the device, can cause heat to not dissipate properly. In fact, some users have reported strange operation from the iPhone when using a heat-blocking case or cover. Be especially wary of silicone covers — they tend to act as insulators.
- Put it in Airplane mode: Powering down various internal circuitry by putting the device in Airplane mode (Go to the Settings pane and slide Airplane Mode to On.
It also appears that some iPhones are more prone to excessive heat than others. If you’re concerned that your unit’s heat is abnormal, contact Apple.
Meanwhile, the iPhone user manual states:
“When you’re using iPhone or charging the battery, it is normal for iPhone to get warm. The exterior of iPhone functions as a cooling surface that transfers heat from inside the unit to the cooler air outside.”
Feedback? info@iphoneatlas.com.
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1 Comment
Posted by Bern Shanfield_1
15 August 2007 @ 7pm
iHandwarmer-
I had my iPhone in my pocket for about a two hour’s drive. When I checked it at a rest stop it was hot to the point of feeling close to too hot to touch. My hands are not thin skinned. It was shockingly hot. I removed it from the incase I use with it and after about seven minutes it returned to a normal temperature. I had to resist the temptation to put it in one of the refrigerator cases at the convenience store I was in.
While it was cooling down I attempted to put it in sleep mode and the screen went black then came back on with only the left side (in landscape mode) showing some letters against a black screen. (I’m now thinking it’s toast.) I had fully charged it before the trip and the power meter showed it to have less then half a charge. Had it been winter it would have made a splendid handwarmer.
Anyway, I did manage to get it back in and wake from sleep mode and it now showed a full charge (must be the fusionpack hack kicking in…) One more reset and again back to less then half a charge with the screen working normally.
It has been operating normally from that point forward (its been over a week now) tho I hate to think about how much the components have aged from that heat bath.
I called the local Apple store and nobody there had hear of anyone reporting that kind of overheating.