Invalid SIM - none of the usual solutions work

We got AT&T to unlock an iphone 4 that we had used in the States and then taken abroad. Spoke with them several times to confirm the phone is unlocked.
Then downloaded latest OS, did a backup and restore over iTunes, reset it to factory settings. We have now tried 3 different SIM cards to activate the phone with, but always get the "SIM not valid" message ("only compatible SIM cards from a supported carrier may be used to activate phone..."etc). These SIM cards all work just fine in our other iphones 4 and 4s. So - its not a SIM card issue, and the phone is on the latest OS. Trouble is, AT&T say its no longer their problem, and we live in a country where there are no Apple stores (Lebanon).
Any ideas anyone? We really need to use this phone :(. Thanks.

Yeah, but if officially unlocked, updating will not lock it back again.
Anyway as said before, nothing can be done here in this forum. You have to call AT&T.

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Invalid SIM - none of the usual solutions work

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