Unlock Code for Old Nokia

Hi, just wondering whether anyone could very kindly help at all please? I still use a very old phone, a Nokia 6822a released in 2005, this particular one was bought on Ebay a couple of years ago. I have been happily using this phone on my Plusnet mobile sim but as Plusnet mobile is now shutting down I have switched to an EE Sim (offered unlimited calls and texts for £4 a month)
The trouble is that when I put the EE sim in I find the phone must be locked to a network (I would guess Orange). It's not that the sim is incompatible with the phone as I have another badly battered phone of the same model and it works fine.
Back in the day there were free websites where you could put in your phone details and it would calculate an unlock code. This worked really well but I can't seem to find any that still work. Could anyone offer any help please? I know there were some experts on this board on the subject back in the day.
I tried calling EE but after being on hold for 20 minutes they basically said "Google it" (which of course I had already done)
Oh, and please don't suggest getting a smartphone as that wouldn't be particularly helpful. Many thanks.

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