Straight Talk Iphone 3gs

I recently got a AT&T iphone 3gs & switched it to straight talk. It works perfectly, BUT when I try to download apps or anything like that, it says that I need to update the version to a newer one. But on my settings it doesn't say software update anywhere & when I plug it into my computer & go onto itunes to check for updates it says that the version I have is up to date & I have version (4.2.) It's ridiculous because I know that there are newer versions. I can barely use my phone because I can't download anything for it.

Does anybody know why it's doing this & how to fix it. Anything helps!

Sadly I don't know the answer to why you can't update your iOS… But I think you have a better chance resolving this question at the apple forums…
and try this How to if this helps any? Gives a bit more information at the bottom about proxy servers and such.

http://support.apple.com/.../kb/HT4623

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