How to uninstall iso6 on my iphone 3gs?

Q. I have install iso 6 to my ipone 3gs but my sim card is not compatible. How can do now,?

I would go to what ever company you are with (optus, vodaphone etc) and get them to transfer your sim to a sim that works.

It's hard to downgrade…
and i didn't even know ios6 was compatible with 3gs.learn something new everyday.

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