HT4623 How to change OS of iPhone 3GS?

I'm having iPhone 3GS with some old OS due to which I am unable to download any app etc. I want to know that how can I update my Os?

See the chart below to determine whether you can upgrade your device and what you can upgrade to.
IPhone, iPod Touch, and iPad iOS Compatibility Chart
     Device                                       iOS Verson
iPhone 1                                      iOS 3.1.3
iPhone 3G                                   iOS 4.2.1
iPhone 3GS                                 iOS 6.1
iPhone 4                                      iOS 6.1
iPhone 4S                                    iOS 6.1
iPhone 5                                      iOS 6.1
iPod Touch 1                               iOS 3.1.3
iPod Touch 2                               iOS 4.2.1
iPod Touch 3                               iOS 5.1.1
iPod Touch 4                               iOS 6.1
iPod Touch 5                               iOS 6.1
iPad 1                                          iOS 5.1.1
iPad 2                                          iOS 6.1
iPad 3                                          iOS 6.1
iPad 4                                          iOS 6.1
iPad Mini                                     iOS 6.1
Select the method most appropriate for your situation.
Upgrading iOS
   1. How to update your iPhone, iPad, or iPod Touch
   2. iPhone Support
   3. iPod Touch Support
   4. iPad Support
     a. Updating Your iOS to Version 6.0.x from iOS 5
          Tap Settings > General > Software Update
     If an update is available there will be an active Update button. If you are current,
     then you will see a gray screen with a message saying your are up to date.
     b. If you are still using iOS 4 — Updating your device to iOS 5 or later.
     c. Resolving update problems
        1. iOS - Unable to update or restore
        2. iOS- Resolving update and restore alert messages

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HT4623 how do i update my iphone 3gs as it keeps saying that 4.2.1 is the right update which its not

how do i update my iphone 3gs as its got 4.2.1 and its saying that it is the right updatee but its not

To expand on the 1/2-answer that Diesel gave;
The first thing you should look into is which version of iTunes you have. If you're not running iTunes 10, then you're not going to be able to update your phone past iOS 4.2.
Depending on what kind of system you're using, there are several reasons why your iTunes may be out of date:
In the Mac world, if you're not running a version of OS/X newer than 10.5.x (Leopard) then iTunes won't upgrade to the latest version (10). If you have a pre-2006 G-series processor Mac, you're pretty-much stuck at 10.4.x (Tiger) or lower and, sadly, Apple/iTunes doesn't support those machines any more. If your Mac is newer than 2006 but older than 2008, you'll likely be stuck at finding a copy of Snow Leopard (10.6.x) and you need to see your local Apple service provider to see if they can get you updated.
If you're running a Windows workstation, I believe that any Windows machine that's still running XP patched to Service Pack 2 or later should still be able to install and use iTunes 10. The system requirements can be found on the iTunes download page. If for some reason your iTunes has stopped doing its updates (or won't do them) you'll probably need to re-install iTunes. Installing over-top of the old iTunes should work and you won't loose any of your data - however, just in case, you should back-up your computer prior to making any significant changes to the software.
Now, Diesel also made the assumption that you may only have a 3G phone and not a 3Gs. To verify this not the case, plus for anyone who may be reading this and has any doubt, this link will help you identify your phone. iOS 5 and later does not support phones older than the 3Gs, and its unlikely that your cellular service provider will for very long either.
Good luck.

HT4623 How to copy contacts from iPhone 3gs to iphone 4.

How to copy contacts from iPhone 3gs to iphone 4.

First youll need to back up all your contacts to you computer, then sync your new iphone and be sure to tick the boxes to sync all you contacs. Also if your iphone 3 has icloud, back them up to icloud, and then restore your new iphone from a icloud backup, No computer needed

HT4623 how can i switch my iphone 3gs at&t to t-mobile?

i am a t-mobile customer, i had a tmobile network phone, it broke, so i bought a iphone 3gs and its at&t, how do i switch it to tmobile?

You would have to contact AT&T. They are the only folks (as the original cellular carrier of the iPhone) that could possibly unlock it.

HT4623 how do i update my iphone 3gs to a software better then ios 4.0 it keeps saying no update available

i need help updating my 3gs i cant get it to update past ios 4.2 and not many apps are compatiable inless i have ios 5.0 or greater can anyone help?

The iPhone 3G will not upgrade past iOS 4.2.1, but the iPhone 3GS is supported up to iOS 6.1.3. Are you sure you have a 3GS and not just a 3G?

HT4623 How to upgrade i.os iPhone 3GS

How to upgrade i.os iPhone 3gs

This link explains how to update using itunes
This explains how to transfer purchases to your computer

HT4623 How do you update the iPhone 3gs to the latest software?

I do not have an iPhone 4. I have an iPhone 3gs, and am trying to update the latest software. I have tried three times already, and each time I have to wait 2 hours so it is frustrating. It has not worked a single time yet. Not much on the internet talks about updating a 3gs to the latest software, but I finally found something that said I had to have the latest iTunes. I did not have the latest iTunes, so I am trying that now. Hopefully that works. If there's something I really need to do, please help. I just want the latest software.

Connect your phone to iTunes on a PC and you will be guided from there.
Or - you could use the search facility on this page - there are thousands of hits.

HT4623 How do you update an iphone 3gs to iOS 5?

I've been having a lot of trouble just simply updating my iphone.
<Edited by Host>

Connect to iTunes on the computer you usually Sync with and “ Check for Updates “...
If an Update Appears Install it... if not... you are up to date for your particular Device...
See the Using iTunes Section Here...
How to update your iPhone, iPad, or iPod touch

HT4623 How can i update my iphone 3gs from ios 4.2.1 to ios 6.1

Already tried to sync with itunes and was advised when selecting check for update that current ios is 4.2.1. ios 5 or higher is needed for most apps on app store.

Read the article from which the question was posted and follow the directions.
Identifying iPhone models

HT4623 HOW TO CHANGE TIME ON MY IPHONE 3GS I HAD UPGRATED IT TO 6.1.3 WORLD CLOCK AND ACTUAL TIMING IS DIFFRENT

how to change time on iphone 3gs
world clock n actual timing is different
ios6.1.3

That's because iTunes 11 requires Snow Leopard or higher.

HT4623 please help!! how can i configure my iphone 3gs because i've been updated a new version i did it but it's hard to activate it again.

please help!! how can i configure my iphone 3gs because i've been updated a new version, i did it but it's hard to activate it again. this message i always recieved in my iphone
"We're sorry, we are unable to continue with your activation at this time."

You phone was hacked. You can not get help with it here. Hacking / Jailbreaking voids any warraty and forfeits your right to support. Discussing jailbroken / hacked devices is forbidden by the terms of service here.

How do I update my iphone 3GS to IOS 6?

How do I update my iphone 3GS to IOS 6?

If your 3GS has iOS 4, see:
http://support.apple.com/kb/HT4972
Otherwise see:
http://support.apple.com/kb/HT4623
Regards.

HT4623 Can I still update my iPhone 3GS wirelessly?

How do I update my iPhone 3GS wirelessly. There's no "software update" in settings

The option to update without the computer (Over the air) was made available with iOS 5. If your iDevice is using a version of iOS lower than 5, you will need to use iTunes on your syncing computer to perform the upgrade. Use the Apple link below as a guide for the upgrade.
http://support.apple.com/kb/HT4972
Also read the instructions from the section entitled "Update your device using iTunes" at the link below.
http://support.apple.com/kb/HT4623
Information regarding transferring purchases from your iDevice to iTunes on your syncing computer can be found at the link below.
http://support.apple.com/kb/ht1848

HT1414 how can i activate my iphone 3gs after upgrading to ios6? it could not activate....

how can i activate my iphone 3gs after upgrading to ios6? it could not activate....

If your phone was previously hacked to unlock it, when you updated the hack was removed and it's re-locked to the original carrier. The phone will now activate and operate only with that original carrier.

How can I update my iPhone 3gs to iOS4, after iOS5 came out?

I am still running iOS 3 (1.3) on my iPhone 3GS and I'm happy with it - but all the new apps requires iOS4 and now I'm sick of this. I want iOS4 (and not iOS5, cause it will drain my battery as far as I've understood).
How can I update my iPhone 3GS in a normal way to iOS4, through iTunes or another easy way? I have never jailbreaked an iPhone so I don't know too much about "backdoors" into my iPhone.

The only Firmware in the iOS 4 series that Apple is still signing for the iPhone 3GS is 4.1. So you could restore to 4.1. You will have to download the 4.1 IPSW from Apple, and then install it with iTunes, Option Click Mac or Shift Click Windoz, on the Restore Button and then select the 4.1 IPSW on your computer. The current iTunes may give meaningless Errors, I doubt because you are Upgrading. But if Error Message is given you will have to search the Web for ways to Exit Recovery.

HT4623 How to change OS of iPhone 3GS?

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