unlocked iPhone, but ask for the activation of the SIM

I bought an iPhone 6 from the UK as a factory unlocked. I have never had any problem with any carrier other whatsoever. Recently, I restored (also tried in DFU mode) iOS phone and on the restoration, he asked for activation and said that my SIM card was "invalid". I tried with several SIM cards and yet no progress. At the same time, I checked the IMEI and it showed that it was locked to O2 UK, I spoke to O2 and they said that the phone is unlocked. Since then, I have restarted the phone and tried again, but made no progress. Is there something that I am missing? Can someone help me?

I would appreciate your help as I was without a phone for 2 days.

I get the following on my iPhone:

And the following in iTunes:

Tags: iPhone

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