[AT&T LG Optimus G] [r.]GimP:
From http://xdaforums.com/showthread.php?p=44929981#post44929981

(edit - all that tape covers areas i didn't want to short, antenna connections mostly. )

View attachment 2220069

So I actually went for it. This is 8 layers of aluminum foil stacked, by folding on of the precut sheets on top of itself until it almost exactly matched the internal dimensions of the LGOG.

This picture is slightly dated, The red+blue borderd box indicates more material I had removed and is no longer present in the rear cover of the phone. The WiFi antenna is located in the backplate for our phone, I thought it wouldn't be affected by the foil but there were two seperate issues.

1.) The contacts themselves didn't always make contact, effectively leaving no antenna.

2.) wireless signal sucked :)

Also, directly under that area on the opposide side of our mainboard is the LTE antenna. Again *should* is the key work that in theory it would run with no issues, able to radiate out the front of the device.

1.) LTE signal was dramatically impacted. Disabling LTE and using 4g showed fantastic signal. So if you don't use LTE or have LTE in your area this foil can stay, maybe increase the cutout around the contacts so WIFI antenna reattaches correctly.

Also note the cutout area on the bottom. That is our main antenna block attached to the speaker.

1.) Every part of the antenna areas has to be taped to try and use this area.

2.) Foil by itself with no thermal interface material is very unlikely to be sponging or collecting any heat at this relative distance from the hotspots anyway.

3.) Overall signal sucked, not worth it.

Take note of the two metal shims on the top and right of the battery. There is an almost entirely metal "basket" that houses every bit of our phone on the front side.

1.) This is in place to transfer some of the heat that the foil picks up from the transceiver module (metallic thing that is NOT taped over above the top right corner of the battery)

2.) This yeilds a very nice increase in thermal "density" overall. It is a much increased area over which has to heat to reach thermal equilibrium.

In the end I've been running this for about a week now. Placebo effect over and done, testing here and there and I can report.

It makes a dramatic impact on overall temperature regulation of the phone. It does not completely eliminate the hotspot on the back but it does spread it very effectively.

The phone can still reach "thermal saturation" as it were, and will given enough time. There is a weird tradeoff now involved, and I'd have to go back and test this separate to draw any definite conclusions, thusly;

1. You now have more material that can eventually heat up to the point where the phone throttles, this naturally takes much longer to occur (which is good)

however, in theory, this added material still has to find a way to radiate its heat, which might take LONGER to do so.

However, however: :D ..You also have a greatly increased the surface area that this material can dissipate heat over, so it could take LESS time.

Needs to be tested, but subjectively I can say it is better overall.

Most dramatic increases I get for my personal use case that made this worth it,

repeated restarts from multiple flashes and validating startup tweaks, voltage settings, governer advanced settings properly all taking and setting, etc. Much cooler overall, verified by constantly checking CPU and Battery temps during and after.

Running the phone on LTE, with bluetooth and GPS on, while actively navigating with maps, while actively streaming audio to my car stereo via bluetooth, while hooked up to car charger.

Does NOT hit the point where the screen is impossibly dim and refuses to charge because of how hot the phone gets doing this.

If you've used your LGOG as navigation while docked to a stand on your dash you know exactly how hot this phone can get. It also cools itself insanely faster after this.

Ultimate tradeoff: I have slightly less signal for LTE overall, and it's very slight. I could continue customizing my cutout, and will eventually, but this is working very well for now. It's almost much cleaner than the picture indicates, as once I finalized what worked I trimmed all the edges and cutouts around the backplate fasteners, etc.

Good luck and have fun if you're feeling adventurous.