HT4623 where do I go to update my phone if I have an Iphone 4 that has never been upgraded so it can't be done wirelessly

Can anyone help direct me to the correct site to get the most current iso update for my phone? It still has the original iso and when I went to AT&T store they said it would have to be done thru a computer which I do not have access to one at home. (NO INTERNET)

If you don't want to delete everything then disconnect it and use the computer that you previously synced with.

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