Iphone 3g keeps rebooting itself - Help!

Since yesterday my iphone 3g has been going very slow. Today it decided just to give up on me completely. Wouldn't let me into any of my apps etc. So connected to my laptop, but gave me two error messages the first one being a number saying it was an error. The second one said that the iphone wouldn't let it connect.
It has now decided to just keep rebooting itself, taking about 5 minutes to load up & then flicks to home screen then reboots again. Tried holding in the off button & home at same time to over write the restart. Nothing.
Any suggestions would be grateful? Phone is just 2 years old!
Thanks x

Restore it from you backup. Use Recover or DFU mode if iTunes won't recognize it.
http://www.ihackintosh.com/2009/06/recovery-mode-and-dfu-mode/

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My iPhone 5 keep rebooting itself after update to iOS 8? My friends iphone 5 is doing it too...already reset the phone and the problem till happen.

My iPhone 5 keep rebooting itself after update to iOS 8? My friends iphone 5 is doing it too...already reset the phone and the problem till happen.
What at can I do to fix the problem???

Hello there, Fernandox26.
The following Knowledge Base article offers up some great steps for troubleshooting isues with unexpected power issues with your iOS device:
iPhone: Hardware troubleshooting
http://support.apple.com/kb/ts2802
Will not turn on, will not turn on unless connected to power, or unexpected power off
Verify that the Sleep/Wake button functions. If it does not function, inspect it for signs of damage. If the button is damaged or is not functioning when pressed, seek service.
Check if a Liquid Contact Indicator (LCI) is activated or there are signs of corrosion. Learn about LCIsand corrosion.
Connect the iPhone to the iPhone's USB power adapter and let it charge for at least ten minutes.
After at least 30 minutes, if:
The home screen appears: The iPhone should be working. Update to the latest version of iOS if necessary. Continue charging it until it is completely charged and you see this battery icon in the upper-right corner of the screen . Then unplug the phone from power. If it immediately turns off, seek service.
The low-battery image appears, even after the phone has charged for at least 20 minutes: See "iPhone displays the low-battery image and is unresponsive" symptom in this article.
Something other than the Home screen or Low Battery image appears, continue with this article for further troubleshooting steps.
If the iPhone did not turn on, reset it while connected to the iPhone USB power adapter.
If the display turns on, go to step 4.
If the display remains black, go to next step.
Connect the iPhone to a computer and open iTunes. If iTunes recognizes the iPhone and indicates that it is in recovery mode, attempt to restore the iPhone. If the iPhone doesn't appear in iTunes or if you have difficulties in restoring the iPhone, see this article for further assistance.
If restoring the iPhone resolved the issue, go to step 4. If restoring the iPhone did not solve the issue, seek service.
My issue is still not resolved. What do I do next?
Contact Apple Support.
Thanks for reaching out to Apple Support Communities.
Cheers,
Pedro.

IPhone 3g keeps rebooting itself

yesterday all of a sudden every time i checked my phone i had no signal bars. i figured it was the area i was in. once i left it continued to have no service. i turned it off then back on and since then it keeps rebooting itself. i connected it to itunes to try to restore it and it restores but does not sync. it reboots midway through the process. can anyone help me out?

Well the post says the question is answered - but a quick search on Google for "iphone keeps rebooting" reveals many thousands of people with this problem... including me yesterday!
I seem to have gotten mine fixed... Somehow I managed to get the phone to reboot in recovery mode. This stopped it rebooting, as long as I didn't press the round button. After that, without starting it or pressing ANY buttons I plugged it into my laptop and selected restore. This restores the firmware, but when I tried to then re-sync the songs, it crashed again. I thought it was all over. However... the second time I did indeed manage to re-sync everything - and so far to day, everything seems reasonably stable. Mind you. I have to "reactivate" my phone connection with O2 in the process though... very odd and frankly Apple should be a bit more open about this clearly known issue and tell us what to do... either play around or get straight to a store.
Dixon.

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i left my iphone 4 in my car in sub zero temperatures for a few hours while skiing and when i came back it started acting all weird and refused to turn on. so thinking it was just cold and needed some time to reheat itself, i wernt home and plugged it in and let it warm itself back up for the night. i went and checked on it later on in that same day and i would work, but the processing seemed unusually slow. for example the screen and menu button would delay bigtime. thinking it was still a little cold i decided to reet it and then from there it progessively got worse to the point where neither the screen or menu button would work. i have tried plugging it into my computer, itunes will read that my iphone is there but it just keeps turning itself on until it reaches the lock screen, then it will reboot itself and continue this process. some help please!!!

Clear the App from background memory, and then try it again.
Do not use the faulty App.
If this happens with all Apps, Restore iphone firmware with iTunes, when asked at end set up as New.
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I have recently bought an iphone 4 it is running iOS 5 and once i finally managed to get it set up after about 10 minutes it starts to reboot itself, i do not now why this is happening, it is gettin very frustrating that i keep losing messages and pictures i take with the camera, i have read on some forums that it could be a battery issue but i honestly could not say for sure, i have tried takin itunes off of my windows 7 computer i have re downloaded the iOS 5 firmware, and still to no avail do i have an iphone that works properly, im wondering if anyone else is having the same issue with this also, but i do ask myself is it a software or a hardware issue???? can anyone help me????

Seems like you are out of luck here. Your warranty is voided considering that you changed the black parts to the white parts. You even tried restoring, which that did not help. Even if you go to the Apple store, it is very unlikely that they will replace it, just because white models are not out and they can check what the actual color of the phone was through the serial number and the model number.

IPhone 4 keeps rebooting itself every 1-2 minutes.

Hi!
Yesterday I got my white iphone 4 parts that I changed out of my black parts through a guide on youtube. Everything went well and put in place, I turn it on and everything worked. Five minutes later my cellphone rebooted itself and I did not think it was anything to worry about. After that it just kept rebooting every minute. I thought it was wrong on the white parts, so I switched back to the black parts again but it continues even now. It works 5min until it gets "No Service" then the screen goes off and the phone reboots. There is also something odd about the battery meter, sometimes it can be 0% and sometimes 100% when it started again.
I have tried everything. Took everything out and put it back in again, done a clean restore from itunes, etc.. Do not know what more I can do.
Anyone know what to do or what the problem is?
Thanks!

Seems like you are out of luck here. Your warranty is voided considering that you changed the black parts to the white parts. You even tried restoring, which that did not help. Even if you go to the Apple store, it is very unlikely that they will replace it, just because white models are not out and they can check what the actual color of the phone was through the serial number and the model number.

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Here are the basic troubleshooting steps:
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Step by step troubleshooting:
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Iphone 3g keeps rebooting itself - Help!

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