can i update my iphone ios

[weedguru_animal]

Is it possible for me to upgrade the ios on my iphone 3g from 4.2.1 to ...4.3????? through legitimate means or otherwise...???

[Weedguru_RyaNayR]

Only if you have the iPhone 3GS, the S is important. If it's just iPhone 3G, which is what I have, then you can't upgrade higher than 4.2.1

If you're having issues with the speed or things not working right, which is a problem i've had, you can always downgrade to 3.1.3. The iOS 4 version was meant more for the newer phones, 3gs and iphone 4... It's therefore pretty unstable on iphone 3g which can barely even run it..

There are online guides how to downgrade iphone 3g to ios 3.1.3
I've done this on mine and it is much faster and way more stable. It used to crash when using apps. like the apps would crash and exit out...