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Hi @ivan12, welcome to our community!
I'm afraid that I won't be able to assist you with this since the code you need to unlock the SIM network lock on your phone has to be given to you by the operator that the phone is locked to, which in this case is O2.
I wish you the best of luck with removing the network lock so you can enjoy your new phone and feel free to write back to me if there is anything else I can assist you with!