What do I do when my iPhone gets hot?

This will be a quick one. Since the gang at Terracotta has about about 5 iPhone users, I've had a few people ask me what to do when an iphone starts to get hot or the battery seems to be draining to fast. This is usually an indication of a rogue app. Same thing sometimes happens on my notebook. On my notebook I usually run the Activity Monitor and then kill the process that is using a bunch of cpu. On the iphone you just have to make an educated guess which app is the problem. It's usually the web browser or Mail for me.

Just hold the home key (The only button on the front of the phone) for 10 seconds with the app you want to kill open and it will get restarted. That will do the trick. This should lead to longer battery life and a cooler phone.

Good luck

UPDATED 4/29/2010:

I've noticed a number of people still hit this blog. I'm pretty sure that iphones now use that home button for screen capturing and the above advice won't help anymore.

So here is what to do now:

From the 3g on the thing to do is restart your iPhone by:

1. Hold down the power button (top of the phone) until the slider comes up asking you if your sure you want to shutdown (This can take about 10 seconds).
2. Just slide it to say yes and wait while it shuts down.
3. When it's done shutting down push the power button again to start up again.

Everything should work better now and the heat should dissipate. Good luck!