I bought a 3G and a 4G in Australia while working there for 3.5 years. I have since returned permanently to the USA and would like to use one of these, understanding the GSM requires using AT

I bought a 3G and a 4G in Australia while working there for 3.5 years. I have since returned permanently to the USA and would like to use one of these, understanding the GSM requires using AT&T? When in Australia, I took these iphones to the Apple Store and they unlocked the 3G for me, knowing that I would be using it in the USA - but when I took it into the AT&T store in California, the iphone would not work with AT&T's SIM card.    May I unlock the 3G and/or 4G somewhere in the USA with Apple's blessing?

If your phones were unlocked by your carrier, they should work with AT&T SIM cards.  You'll have to sign up for an iPhone phone and data plan with AT&T, but the SIM should definitely work.  Go to an AT&T store and have them set up your account and activate your SIM there.
AT&T will NOT be able to unlock your Australia-purchased phones.

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