Xperia 1 SIM/Network locked. Any way to unlock it?

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New member
Jan 26, 2023
Hello everyone,
I bought a second-hand Xperia 1, but the seller didn't tell me it's SIM locked. I have struggled to find a fix for the past month (a couple of shops here said they couldn't unlock it), does anyone know of any software or anything to unlock it? I found threads on this site, but the links are dead.

The phone is Sony Xperia 1 (J8110) Single SIM, I think it's from the UK and not blacklisted.

Thank you.

Edit: I don't know the carrier to which the phone is locked. Also, I'm in the EU, but not the UK, so I can't go to carrier.
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