I updated my ulocked iphone and now I can't do anything at all, how can I repiar this?

My Iphone has been unlocked by att and recently I have updated the phone and now my SIM is unrecognized, how can I repair this?

I'm not completely clear on the GSM / LTE network frequencies in US vs Argentina, but I do know that cross-compatibility can be an issue when buying from one country and using in another. Apple products in particular have this problem. What this sounds like to me is that the phone is not compatible with Argentinian networks; or your friend had an AT&T phone and jail-broke it. This is against the end user licensing agreement, and when the phone is next updated is likely to jam the phone.
Sorry but you lost your money.
Wasted*

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