Considering updating your iPhone forces you to update to the latest software available for the device, updating an iPhone 3GS now will update it to iOS 6.
iOS 5 will be compatible with iPhone 3GS as well as iPhone 4.
To unlock iPhone 3gs on iOS 4.1 you have jailbreak your device first.
Sadly, no. The latest version of the 3rd iPhone (iPhone 3GS) is iOS 6.1.5.
Yes you can, but expect some iOS functionalities that are on, say the iPhone 5S won't carry over to the iPhone 4.
Just plug it into a computer with itunes and find the update button within itunes. It should come up on a screen saying that a new iOs is available would you like to update!
It uses iOS
Yes indeed! The iPhone 3Gs is still available to buy new, and Apple actually continues making them, infact every iPhone 3Gs bought at this time has already got ios 4.0.1 intsalled on it! but by now ios 4.0.2 is already out, so why keep 4.0.1? ;)
iOS 6 came out of beta September 21, 2012 with the launch of the iPhone 5. You can update to the latest iOS 6.1.3 (6.1.4 with the iPhone 5) by going into Settings>General>Software Update or plugging your device into an iTunes authorized computer if you are running anything older than iOS 5. If you are not fond of the iOS 7 update, then you must update to iOS 6 before this fall because after that, Apple forces you to only update to the latest software version or not at all. But you don't have to worry about this is you have a 4th gen iPod Touch or iPhone 3GS which can't get iOS 7.
iOS 6 is the software that was launched with the iPhone 5. You can run this software version on an iPod Touch (4th or 5th gen), any iPad except the original, and the iPhone 3GS, 4, 4S, and 5. You have only this summer to update to it if your device is eligible for an update to iOS 7 coming this fall. If you are running iOS 5, you can update to it from Settings>General>Software Update. If you are running any older iOS, you must plug your device into an iTunes-authorized computer to update. The update is entirely free by the way. You can see more about what features it brings on Apple's website.
There is no iPhone 3. You may be referring to the iPhone 3G or 3GS, which are the 2nd and 3rd generation iPhones respectively. Out of these two, only the 3GS can run iOS 6, while the 3G is stuck on iOS 4.2.1
Yes. It runs a limited version of iOS 6 excluding several features only because the update would slow the phone down to the point of no usability with all of it.
Well on my iphone i got the developer version for IOS 5 before it was released. First you need to download itunes 10.5. go onto apple.com and click the itunes tab. you can find it there. then if your phone is compatible it Will say your phone has an update IF IT IS PLUGGED INTO YOUR COMPUTER. IF IT DOESN'T NOT GO ONTO APPLE.COM AND SEARCH FOR IOS 5