How to remove passcode and restore gifted iPhone 14 linked to a UK account from Europe?
My son was given a 2nd hand iphone 14 as a parting gift by our relatives in the UK during a visit to the UK (I am from the UK, but we now live in Europe). The original owner had not used the phone for a while and had been using a newer model. However, when my son turned on the phone on arriving in Greece it asked for the passcode. As I understand it, my niece's husband (the original owner) should have removed the phone from their account first but forgot to do so. When we phoned him he gave us two possible passcodes to try as he could not remember the passcode he had used. Neither worked. Failure resulted in the phone being locked for a number of hours.
What do they or indeed we have to do to remove the passcode and restore the phone (if that is the word)? Could anyone give me detailed instructions to tell the account owner and original owner of the phone so they can remove the phone from their account. They have apple accounts with icloud plans and so does my family. I do not want to unlock the phone in any illegal way that would invalidate anything or stop us from using our apple accounts. If it is permissible for them to gift a phone, what do they need to do at their end, and what do we need to do at ours? It makes it more difficult as the phone and the account it is linked to are in different countries. They are willing to share their account name and password with me, temporarily of course, and indeed have already done so, saying we should try signing in to itunes on a pc with their details and plugging the phone in to then restore it. My son tried this after downloading itunes on his pc but the program did not recognise the iphone for some reason (every option for device was greyed out). If it can only be done at our end with the phone here (they are family so it is not a problem), what do we need to do? However, I would prefer it if they could do it at their end as I am not very good at these things. Can they sign in to their icloud and do it that way? Thank you in advance for your help.
[Re-Titled by Moderator]