Can I use a verizon sim card in an unlocked at&t iphone 4

davejane said:

I've been given an iPhone 4 from a relative. He told me AT&T unlocked it, and I called them and they confirmed it was unlocked.

I reset it to factory settings, put in my Verizon sim card from another iPhone and it still says No Service

Is it possible to use a Verizon sim in an unlocked ATT phone?

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davejane said:

So does this mean unlocked ATT phones can only be used with ATT sims?

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