Develop Bugs

Ouch Ouch its burning

I was just curious to know if someone else's phone is over heating. Yesterday I was watching a boxing match on youtube with 4G on and it reached to a scary 121°. 4 hours later I was playing the nova demo with the screen at 45% brightness, played for like 20 minutes or so and it reached 112°. Just whanted to figure out if this is normal that personallyI think is not, and also if someone else it's experiencing the same issue. Thanks
Edit: Both of times I was indoorsjust in case someone is wondering.
Sent from my SPH-D710 using xda premium

Mine can get much hotter than that but it pretty much hovers around the 120 range when I'm browsing the web.
I also get this message when charging and watching a video. I need to exchange it. Just need to find a Best Buy store that has one in stock.

What do you use to check the temp?

mine gets real hot as well.. I think it has to do with charging while using though.

Woow thats amazing. Im guessing that those temperatures can be harmful to the phone right?
I use system info from the market to check my phone status very useful
Sent from my SPH-D710 using xda premium

JoeBruin32 said:
mine gets real hot as well.. I think it has to do with charging while using though.
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Click to collapse
It could be that and the stock charge pushed a lot of power in to charge quicker... But my input is that my phone hasnt even gotten very hot at all..
Sent from my SPH-D710 using XDA App

SpartanVissepo said:
I was just curious to know if someone else's phone is over heating. Yesterday I was watching a boxing match on youtube with 4G on and it reached to a scary 121°. 4 hours later I was playing the nova demo with the screen at 45% brightness, played for like 20 minutes or so and it reached 112°. Just whanted to figure out if this is normal that personallyI think is not, and also if someone else it's experiencing the same issue. Thanks
Edit: Both of times I was indoorsjust in case someone is wondering.
Sent from my SPH-D710 using xda premium
Click to expand...
Click to collapse
My phone was just laying in shotgun of my car with the car charger plugged in and the display on, then all of a sudden I picked it up and it was hella hot! 120° read SetCPU and I got shook, ripped the battery out and threw the phone in front of an AC but then I got worried that the extremities could possibly warp the board, so now Im thinking Im going to return my phone! In no way can this be good for the phone, I don't see how it can not get affect it when reaching 120, 130, 140 degrees!!! Im worried that in a week, a month, a year from now something will go terribly wrong and I really don't want to risk it, so I'm real close to returning this phone and just waiting for the Nexus!

I am amazed that a phone getting hot after heavy use is such a surprise to everyone. See any fans? see any ventilation? Here you are using a dual core 1.5 GZ processor, what were you expecting, ice water?

Ahh... Set CPU. So you can't really find the temp until you're rooted?
Hmm

LouieGrandie said:
I am amazed that a phone getting hot after heavy use is such a surprise to everyone. See any fans? see any ventilation? Here you are using a dual core 1.5 GZ processor, what were you expecting, ice water?
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Click to collapse
Who mentioned anything about heavy usage and overclocking? CPU is 1.2Ghz stock buddy and I wasn't doing anything on my phone at the time it overheated...I have a Droid Incredible 2, and I run its CPU OC to 2.035Ghz and its never once gone over 105 degrees, so before you go getting all amazed, get your facts straight!

I have noticed this too.
With the phone simply in my pocket, my leg would feel warm. I could grab the phone and the phone would feel quite hot. Not so hot that it would burn my ear, but warm enough that it would feel like there's some kind of problem. Usually, heat = battery getting drained. When I check to see if there's anything running, there's nothing...
Right now, have been listening to Spotify for over 2 hours, and it's cold as ambient temperature. Will try installing some monitoring program and report if I notice more heat issues. I know the Evo3D used to get "burns my ear" hot when using it as GPS while connected to the car charger. My guess was that if the screen is on, and there's power going to it, it'd always get hot. Maybe it wasn't supposed to and that was just my assumption. However, same thing happens to this one; watching netflix, or playing a game, or anything demanding, and if I'm plugged, it will get really hot, really fast. If not connected, it won't get as hot, but "normally" hot nonetheless.

http://an.droid-life.com/2011/09/21/is-your-samsung-epic-4g-touch-getting-too-hot-to-handle/
Feel free to stop by and comment if you're having similar problems.

jromankvcc said:
I have noticed this too.
With the phone simply in my pocket, my leg would feel warm. I could grab the phone and the phone would feel quite hot. Not so hot that it would burn my ear, but warm enough that it would feel like there's some kind of problem. Usually, heat = battery getting drained. When I check to see if there's anything running, there's nothing...
Right now, have been listening to Spotify for over 2 hours, and it's cold as ambient temperature. Will try installing some monitoring program and report if I notice more heat issues. I know the Evo3D used to get "burns my ear" hot when using it as GPS while connected to the car charger. My guess was that if the screen is on, and there's power going to it, it'd always get hot. Maybe it wasn't supposed to and that was just my assumption. However, same thing happens to this one; watching netflix, or playing a game, or anything demanding, and if I'm plugged, it will get really hot, really fast. If not connected, it won't get as hot, but "normally" hot nonetheless.
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That you know of, did they ever fix the issue on the Evo3D?

Let me put it another way. I don't see any process or feature that will cool down the phone when in moderate to heavy use. I expect it to get hot. I have always thought, how are they going to disperse the heat?

LouieGrandie said:
Let me put it another way. I don't see any process or feature that will cool down the phone when in moderate to heavy use. I expect it to get hot. I have always thought, how are they going to disperse the heat?
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I don't know dude but what I do know is that I have the Incredible 2 overclocked to over 2Ghz!!! and my Xoom at 1.7Ghz and neither one of them has every gotten this hot before!!

JungleJiujitsu said:
I don't know dude but what I do know is that I have the Incredible 2 overclocked to over 2Ghz!!! and my Xoom at 1.7Ghz and neither one of them has every gotten this hot before!!
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Ill second this srongly, I think than anything over 107 with this technology is NOT friendly at all.
Sent from my SPH-D710 using xda premium

Mine got hot on day 1 from youtube and general setup but after a full nights charge it has been great for 2 full days, no heating up or anything weird.
But man did it get hot!
Edit: I turned off gps the night this happened. I have been using my phone alot and have not experienced this again.

You need a dose of Penicillin and Cortizone. The burning sensations should clear up. In the mean time, stay away from strange phones and turn off the vibration loop - LOL
Sorry, but I've done quite a bit with my phone (videos, NetFlix, etc...) and it doesn't get warm enough to burn.

An Intel CPU (i7, for example) can run at 200 degrees Fahreneheit. In fact, the roof is about 100 degrees Celsius. To protect the CPU, there are heatsinks, fans, water cooling, etc. Video cards can also go up to 70 degrees celsius before showing artifacts; some can do much better.
We're commenting a heat that is not nearly that much for a phone. IF the SOC gets to 100 degrees celsius, that's one thing; 100 degrees fahrenheit...that is the temperature in many places around here.
These SOC don't need such fans, heatsinks, etc, because they're not supposed to reach temps of 200 degrees. They should be self contained.
On my Evo3D, which I passed on to my father, I could smell like something was burning. It wasn't, but it smelled like if it were, around the battery. Yeah, it still gets hot when in use, and specially if connected.
I believe there's also comments that on all new phones, the first few charges, while the battery adapts, the phone may be hot. Of course it had been over 2 months on my Evo3D and it still gets hot.
The E4gT is doing better today, but I haven't thrown any video/games at it yet; nor has it been in my pocket.
I'd say give it a couple days. I know I've reported my own concern, and I'll be checking it to make sure the "hotness" is within reasonable limits.

vanberge said:
Ahh... Set CPU. So you can't really find the temp until you're rooted?
Hmm
Click to expand...
Click to collapse
you can check it using this add on http://forum.xda-developers.com/showthread.php?t=809588

S3 getting hot when playing games and..

Hey gang.
Does everyone's s3 get hot when playing games?
Just trying to figure out if it's normal. It feels hotter than other phones I've owned. And want to know if this is common or if I should return my S3
It's really warm when using data (browsing, YouTube etc.) around 95-105°
But gets hot when playing games. Around 120 -125°
Chime in. Would love some feedback on everyone's S3.
Sent from my SGH-T999 using Tapatalk 2

Yes mine does it especially when playing dead Trigger it gets nice and warm near the bottom of the phone.
Sent from my SGH-T999 using Tapatalk 2

horr1blek1tten said:
Yes mine does it especially when playing dead Trigger it gets nice and warm near the bottom of the phone.
Sent from my SGH-T999 using Tapatalk 2
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Click to collapse
Yeah exactly. At the bottom of the phone.
I appreciate fellow S3 owners posting here. Just to put my and everyone else's mind at ease.
Sent from my SGH-T999 using Tapatalk 2

Every smartphone I have had gets warm when playing games for over 30min.
I believe this is normal as long as you monitor and don't over clock a lot. Eventually that can kill your hardware.
Sent from my SGH-T999 using xda app-developers app

Charlie Brown said:
Hey gang.
Does everyone's s3 get hot when playing games?
Just trying to figure out if it's normal. It feels hotter than other phones I've owned. And want to know if this is common or if I should return my S3
It's really warm when using data (browsing, YouTube etc.) around 95-105°
But gets hot when playing games. Around 120 -125°
Chime in. Would love some feedback on everyone's S3.
Sent from my SGH-T999 using Tapatalk 2
Click to expand...
Click to collapse
Yea mine gets hot even if I am just browsing and texting and watching videos .. I guess its normal but its annoying because then my hands get all sweaty .. lol ... but I think the maximum the temp can go to is 60 c which is above 125 f so ur ok
Sent from my SGH-T999 using xda app-developers app

Not only the s3 my iPhone gets hot when playing dead space or surf while charging too
Sent from my iPhone using Tapatalk

today for me was the hottest my phone has ever gotten - 105F. it was 95F outside and i had to turn my screen brightness up so i could see, on top of surfing the web and chatting on the phone. someone commented in another thread that our phone can go up to 140F without issue. i dont know if thats true, but there ya have it...oh, i havent played any games yet

Been monitoring temps with system tuner under different stress levels. Playing gta3 I pushed temps to 52°C.
Internet browsing has me around the low 40s. At idle the temp is around 32-35C
My ambient temp in my home is about 73-74 F.
None the less this phone is one hot tamale! Lol
Sent from my SGH-T999 using Tapatalk 2

I've only played one game for any extended period of time so far which is Home Run Battle 2 and my GS3 doesn't get hot at all. It runs just slightly warmer than it usually does but it's by far the coolest phone I've eve had.

Get really hot when browsing too long 30 min +
Sent from my SGH-T999 using xda app-developers app

My phone gets warm as well. The temp is about average just like the rest of you guys so I wouldn't worry. Having a very thin back cover doesn't help either.
Sent from my SGH-T999 using xda app-developers app

Under voting helps with this a TON. I took my voltage for 1.5ghz from 1150mv down to 1025mv and it stays much much cooler under full load. Oh and temps won't break your cpu, too much nanny software on this chip. Even over clocked. Over voltage may though =)
Sent from my SGH-T999 using Tapatalk 2

not really

So far I tried playing Final Fantasy 3 on it, definitely very warm, but not hot to touch. Others include Youtube and prolong Web Browsing. Music is fine however. :victory:

benefit14snake said:
Under voting helps with this a TON. I took my voltage for 1.5ghz from 1150mv down to 1025mv and it stays much much cooler under full load. Oh and temps won't break your cpu, too much nanny software on this chip. Even over clocked. Over voltage may though =)
Sent from my SGH-T999 using Tapatalk 2
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Click to collapse
hey, how's it going man... has this phone replaced your Asus Transformer Prime? I haven't touched the tablet in a while since owning this phone

MRCANNADY said:
hey, how's it going man... has this phone replaced your Asus Transformer Prime? I haven't touched the tablet in a while since owning this phone
Click to expand...
Click to collapse
Hey dude!
Yup this phone rocks so hard! Yeah I sold the tablet... Still gotta get rid of the dock will probably list it soon.
Sent from my SGH-T999 using Tapatalk 2

The phone gets really warm on stock. The cpu has a temp control feature that if it gets too hot it will slow down. The cpu is made to work up to really high temperatures so I wouldn't worry too much about it.
If you flash to a custom kernel, they are lowering voltages on some of the frequencies and I am noticing an incredible loss of heat. My phone does not get warm anymore, at least no where near stock.

etherealglimpse said:
The phone gets really warm on stock. The cpu has a temp control feature that if it gets too hot it will slow down. The cpu is made to work up to really high temperatures so I
wouldn't worry too much about it.
If you flash to a custom kernel, they are lowering voltages on some of the frequencies and I am noticing an incredible loss of heat. My phone does not get warm anymore, at least no where near stock.
Click to expand...
Click to collapse
This. Like faux said some of the chips run the same voltage across many frequencies (in my case 1150mv) I was able to lower them into the 850-1050s which is crazy low. Remember power draw goes up exponentially with voltage change.
Sent from my SGH-T999 using Tapatalk 2

Is it possible that the American version (dualcore 2gb ram) doesnt get as hot as the international one (quadcore exynos 1gb ram)?
Mine gets pretty hot as well when i play for long times, i guess the main reason why many people are talking about this is that the Chipsets are located directly at the bottom where you would hold your phone while gaming in portrait mode for example. So you can directly feel it and the heat of your hand further warms the phone My Tegra3 tablet gets pretty hot as well in one spot - where the cpu is, but its not a place you normally place your hands, so you wont even notice that it gets warm.
Same thing was with my previous phone the DesireHD. It never got hot on the places where i held it, so you think it wont heat up at all.
In general though: I have some experience with cpu clocking on PCs and overclocking and stuff. It depends a little on the chipset of course but in general temps like 50-70° C are no problem at all for CPUs.
Workaround on SGSIII: Enable power save mode CPU. It reduces the clock to 1ghz (at least on my rom - stock jelly bean polish release), it still runs most games and UI perfectly smooth in jelly bean but it gets considerably less hot.

if i install many apps at once (testing new roms) my phone gets hot

Average battery temperature well over 100 degrees Fahrenheit

My ion stays either just over or right under 100 is this normal cuz when I'm really using it it's uncomfortable to hold is that a drawback of the s3 cpu I'm on .29 deodexed intd smoothed ion status bar and stock home with mods any one else experience this
Sent from my LT28at using xda premium

techdeisel said:
My ion stays either just over or right under 100 is this normal cuz when I'm really using it it's uncomfortable to hold is that a drawback of the s3 cpu I'm on .29 deodexed intd smoothed ion status bar and stock home with mods any one else experience this
Sent from my LT28at using xda premium
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Click to collapse
The phone should not be uncomfortable to hold. How are you measuring the battery temp? Two things that I am aware of cause heat; one is battery, the other is the CPU. My CPU runs around 100f-102f under normal use. If your battery is getting hot, there is a problem. My phone got uncomfortably hot the first day. I ended up doing a restore through Sony PC Companion and that fixed it. I've since had buildprop tweaks cause my phone to heat up beyond my comfort level. You either need to know your phone really well and troubleshoot the thing one by one or do a factory restore / reflash the ROM and take it slow on the app and tweak installs while testing each level of change. This is the way I do it. Other's may do it differently.

Mine is at 87 f right now just in my pocket data off but after opening this app and screen brightness at 50% its at 93 and it's only been a few minutes. I have a battery app it just says temp so I assume its my battery but anyways, how heavy you use the phone will alter its temp, I've had mine up to, if I recall correctly, 120f the phone will shut off when it's at a dangerous temp like my iPhone I left in my car to charge one summer day, we called my car the hot pocket, but the high heat shut it off and every time I tried to turn it on I got an warning and a shut off so I tossed it in the freezer. Anyways long story short, the heat you feel is how the phone keeps itself from over heating. If it's too hot for you lower your brightness that helps so much, but 100f isn't that bad for running temp
Sent from my LT28at using xda app-developers app

thanitos said:
Mine is at 87 f right now just in my pocket data off but after opening this app and screen brightness at 50% its at 93 and it's only been a few minutes. I have a battery app it just says temp so I assume its my battery but anyways, how heavy you use the phone will alter its temp, I've had mine up to, if I recall correctly, 120f the phone will shut off when it's at a dangerous temp like my iPhone I left in my car to charge one summer day, we called my car the hot pocket, but the high heat shut it off and every time I tried to turn it on I got an warning and a shut off so I tossed it in the freezer. Anyways long story short, the heat you feel is how the phone keeps itself from over heating. If it's too hot for you lower your brightness that helps so much, but 100f isn't that bad for running temp
Sent from my LT28at using xda app-developers app
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Click to collapse
Bright at like 20% since I took it out the box
Sent from my LT28i using XDA Premium HD app

KEB64 said:
The phone should not be uncomfortable to hold. How are you measuring the battery temp? Two things that I am aware of cause heat; one is battery, the other is the CPU. My CPU runs around 100f-102f under normal use. If your battery is getting hot, there is a problem. My phone got uncomfortably hot the first day. I ended up doing a restore through Sony PC Companion and that fixed it. I've since had buildprop tweaks cause my phone to heat up beyond my comfort level. You either need to know your phone really well and troubleshoot the thing one by one or do a factory restore / reflash the ROM and take it slow on the app and tweak installs while testing each level of change. This is the way I do it. Other's may do it differently.
Click to expand...
Click to collapse
Battle Mon hd an WiFi tether both have temp readings this is where I'm getting my readings
Sent from my LT28i using XDA Premium HD app

120f is a bit high for everyday use, but for gaming etc its normal.

U'll have to underclock it. 1.5GHz is hot while display on.
Lower down to around 1GHz or 972MHz. (I'm using it, to me its lag free)

[Q] what is your Galaxy s3 average temperature

My Galaxy s3 gets hot
My Normal Temprerature is 90 Fahrenheit
this is normal?
i´m only turned on a wifi, or watch a movie on youtube and my phone is already hot
and with the 4g turned on is more hot around 100 Fahrenheint
i have the t-mobile version. android 4.1.1 jelly bean stock rom

Yeah mine gets pretty hot too... I've seen it hit 105. Very bad for the battery :/
Have you checked for rogue processes? Get GSAM Battery Monitor or Watchdog Lite and see if anything is consuming a lot of CPU cycles.
Also, try CPU Sleeper - it shuts one of the cores off when the phone goes to sleep which gives huge battery savings.

I wouldn't do all that doing something that it wasn't intended to be, shutting down a core. Android does a good job with all that, if it gets really really hot
Buy a new battery or better yet start from scratch see if you get it stock. My s3 never been really hot, and I know what hot is coming from the g2x and the first galaxy now those phones will burn you.
Sent from my SGH-T999 using xda app-developers app

daxecutioner24 said:
I wouldn't do all that doing something that it wasn't intended to be, shutting down a core. Android does a good job with all that, if it gets really really hot
Buy a new battery or better yet start from scratch see if you get it stock. My s3 never been really hot, and I know what hot is coming from the g2x and the first galaxy now those phones will burn you.
Sent from my SGH-T999 using xda app-developers app
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Click to collapse
The G2x was nothing compared to the Sensation! OUCH!
And it only shuts a core off when its asleep. You can uninstall the app and it reverts so no harm there.
I have a second battery and it runs on the hot side side as well. My roommate has a white GS3 and I have a titanium GS3 and his battery lasts a hell of a lot longer than mine. It may just be defective. I couldn't get his past 90 degrees.

My battery is running 83/84 degrees, but then I recently changed to a 3200 which fits the original compartment.

EtherealRemnant said:
The G2x was nothing compared to the Sensation! OUCH!
And it only shuts a core off when its asleep. You can uninstall the app and it reverts so no harm there.
I have a second battery and it runs on the hot side side as well. My roommate has a white GS3 and I have a titanium GS3 and his battery lasts a hell of a lot longer than mine. It may just be defective. I couldn't get his past 90 degrees.
Click to expand...
Click to collapse
Yeah that's what I'm thinking, these phones are so random. Kinda like the thing with the dark dots dead pixel when screen is off some come in horrific shape from the box.
Sent from my SGH-T999 using xda app-developers app

westhillsat said:
My battery is running 83/84 degrees, but then I recently changed to a 3200 which fits the original compartment.
Click to expand...
Click to collapse
How much on screen do you get with that battery and do you have a link? Also, is it NFC enabled? I don't need NFC just curious.

Mine was at about 95-98F when I was tethering and stayed pretty constant. The phone was a bit warm, but not worryingly so (it's gotten hotter).
Honestly, I don't think it's a big deal these temperatures seem within normal parameters.
Sent from my SGH-T999 using xda app-developers app

Pennycake said:
Mine was at about 95-98F when I was tethering and stayed pretty constant. The phone was a bit warm, but not worryingly so (it's gotten hotter).
Honestly, I don't think it's a big deal these temperatures seem within normal parameters.
Sent from my SGH-T999 using xda app-developers app
Click to expand...
Click to collapse
I guess for me the fact the screen gets so hot is what bothers me... and the heat on the back, it goes through my Incipio case (both the rubber and the plastic) and its hot at the bottom of the phone... the temp readings are battery only since it seems the processor doesn't have a temperature monitor - that or none of the kernels support it.

galaxy s3 high temp
10 mins of subway surfers and my s3 gets to 107-110 . Is this normal. I have hard reset the device and running on jelly beans 4.1.2 with minimum applications loaded. Normal temprature of the device when idle is 89 to 95. Only the bottom half of the screen gets hot. Took it to the service center they did nothing but reformat it.

Does anyone elses phone get HOT?

I find my OG tends to get noticeably hot during normal use. if I'm doing anything graphics intensive it get super hot. I have never checked the actual temps but its hotter than any phone I've ever owned (also the most powerful :good: ) the heat does not seem to affect the performance of the device it is just a little concerning to me, I know how computers and high heat don't mix well.

How's your signal? Is it low? Do you roam a lot? These can cause your phone to get really warm sometimes hot if your trying to do something that requires data or any type of signal. Its just how CDMA phones are
Sent from my LG-LS970 using xda premium

85gslse said:
I find my OG tends to get noticeably hot during normal use. if I'm doing anything graphics intensive it get super hot. I have never checked the actual temps but its hotter than any phone I've ever owned (also the most powerful :good: ) the heat does not seem to affect the performance of the device it is just a little concerning to me, I know how computers and high heat don't mix well.
Click to expand...
Click to collapse
We have a quad core processor with no type of cooling system whatsoever. It getting hot is normal.
Sent from my LG-LS970 using xda premium
---------- Post added at 03:00 AM ---------- Previous post was at 02:59 AM ----------
tsdeaton said:
How's your signal? Is it low? Do you roam a lot? These can cause your phone to get really warm sometimes hot if your trying to do something that requires data or any type of signal. Its just how CDMA phones are
Sent from my LG-LS970 using xda premium
Click to expand...
Click to collapse
It's not just cdma. It's gsm also.
Sent from my LG-LS970 using xda premium

Enzopreme said:
We have a quad core processor with no you're off cooking system whatsoever. It getting hot is normal.
Sent from my LG-LS970 using xda premium
Click to expand...
Click to collapse
I play some pretty graphic intensive games on my phone and my phone has never got hot from it. Its gotten kinda warm a few times from using the GPS but never "hot" and never even close to "hot" from playing graphic intensive games or any other CPU intensive app
Sent from my LG-LS970 using xda premium

tsdeaton said:
I play some pretty graphic intensive games on my phone and my phone has never got hot from it. Its gotten kinda warm a few times from using the GPS but never "hot" and never even close to "hot" from playing graphic intensive games or any other CPU intensive app
Sent from my LG-LS970 using xda premium
Click to expand...
Click to collapse
Then you're special and probably the only person that can report that.
Sent from my LG-LS970 using xda premium

First, we must establish that "hot" is a relative term. Unless we get some temperatures going, there is no way to know if my "hot" is more or less that someone else's, and so on. I had an Evo3D. My "hot" is "omg, I burnt my damn ear trying to make a freakin phone call!" My "hot" in relation to my Evo4g was "I used the gps a while and now it's kind of warm". Can you grab a temperature when it's up there on the heat scale?
Sent from my LG-LS970 using xda app-developers app

outerpip said:
First, we must establish that "hot" is a relative term. Unless we get some temperatures going, there is no way to know if my "hot" is more or less that someone else's, and so on. I had an Evo3D. My "hot" is "omg, I burnt my damn ear trying to make a freakin phone call!" My "hot" in relation to my Evo4g was "I used the gps a while and now it's kind of warm". Can you grab a temperature when it's up there on the heat scale?
Sent from my LG-LS970 using xda app-developers app
Click to expand...
Click to collapse
I've experienced that kind of hot. My photon got that hot a few times.
Sent from my LG-LS970 using xda premium

I returned my phone 3 times before I decided to actually test the temperature of the phone.
Download OS Monitor from the play store.
Per discussion with LG, you should not see temperatures that exceed 113 degrees F. The hottest I got my phone through extensive testing was 105 degrees (GPS on, moving around roaming zones, all while playing a video game).
Don't worry about the heat -- It is normal with this phone. There is always one or two posts where someone says "oh yeah, my phone never gets hot"... Just ignore it
B

Before the JB update, my OG would randomly heat up just from sitting in my office. I get plenty of signal here and don't often play games. I just picked it up off the desk before going to lunch and it was hotter than hell. Like, this-feels-like-it's-gonna-blow-up-soon hot. A quick reboot fixed that until it kept happening every week or so. It hasn't happened once since the update, though.

Over 100 degrees f
Mine got over 100. It sort of burned my hand when I picked it up. I measured the temperature accurately.

It doesn't help that the phone is glass on it's two largest surfaces and has no ventilation for passive cooling. Glass doesn't breathe and retains heat rather well. Probably not the smartest design idea when putting that much power inside a practically sealed glass box with no real means of ventilation.
☆SoA: Son's of Android™☆
I like to break stuff!

Little known fact, Kim Jong-Un stole an OG in order and it is actually what is generating heat at the core of his nuclear reactor.
OG's getting hot is widespread. Some measures have been taken to mitigate the heat, but there will always be processes that run that are just going to make this thing heat up.

Mine hit 112 F today. But I was at the beach and it was hot, and the phone is black. So...yea. Under normal circumstances it doesn't get that high. Regardless of what I'm doing.

I use a Sprint S3 and it gets pretty hot too, I've heard the S4 plus (s3 chip set) and the s4 pro (Optimus G chip set) gets pretty warm period. Qualcomm need to optimize the heat output better. But as long as it doesn't stay above 110-115 you'll be fine, it shouldn't fry the chip or anything.
Sent from my 'milky' white S3 on the ever-getting-better Sprint network.

Can anyone recommend an app to monitor temperature? I am not rooted and the few i tried didn't work.

My LGOG constantly shuts down due to temp while playing Ingress. Very frustrating. Usually have to hold out the window while driving to cool it down between portals...
Sent from my LG-LS970 using xda app-developers app

I think I'm going to have my phone replaced, is becoming sluggish when its hot and always benchmarks way below average on 3dmark, quadrant, and antutu

85gslse said:
I think I'm going to have my phone replaced, is becoming sluggish when its hot and always benchmarks way below average on 3dmark, quadrant, and antutu
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It throttles performance when it heats up to prevent damage. Quad core processor + 2gb RAM + gpu - no forced air cooling = hot. We just gotta be careful.
Sent from my LG-LS970 using xda app-developers app

i put mine in the freezer regularly to cool it down. works pretty well

Mine burned me today. Turned it on flight mode and put it next to my cold water bottle. I was in av area of low reception and was reading articles when it happened
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