How to get an update on my iphone?

I have an iphone 3gs that still has an old software version 4.1(8B117) but there's an updated version 4.3 out there, and when I hit update button its tells me that everything is up to date, but I know that it's not. How can I get 4.3 version?

Ensure you have the latest version of itunes, and that your phone is 3GS
Connect and everything should be done.

If you've just realised you have the 3G, then you need to do the following instead:
Make sure that your phone is backed up to your computer, everything. (contacts, files… The lot)
Insure your phone
Take it into the back garden and smash it hard with a 14lb sledgehammer.
Explain to the insurance people that it fell out of your pocket whilst cycling and went under the wheels of a truck that was trying to run you down at the time.
get a new phone with updates software, full warranty etc

Hopefully, when they send you the new phone, it'll be one that will allow 4.3

Call your contract provider and simply ask them to do it on your computer using the software and or go to itunes choose iphone and check the update

3GS probably can't update to some versions as the hardware is roughly 5 years old now.

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