Personally if my budget allows then I would buy new and direct from Samsung. Unlocked and new sealed gives some reassurances in terms of warranty, and without an unknown history of its handling and repair work.
Often refurbished can also mean it has been opened, perhaps to replace a damaged screen or another reason. There is no history of this.
Also, from O2 you should hope to be OK, but some handsets are from other regions and not the UK. This can present a problem.
If you do buy refurb because it is significantly less in cost, then make sure you check it over well. Bear in mind you likely won't have manufacturer warranty for 2 years and phone insurance might be harder to get. Some insurers require the phone to be within a few months old.
If the cost differential is not a lot between old vs new, then just buy new.
The S25 ultra that i own is an amazing phone, but does come with the high cost of being the newest Samsung have. A good compromise 'bang for buck' would be the S23 ultra, which can be achieved for a few hundred quid these days, and it a great piece of hardware second hand...for the costs. Just be selective and try and find a good one.
Smiley
------------------------------------------------------------------------
User: Smiley
If my reply has been useful in resolving your issues, then please like and 'mark as solution'.
-
My life is full of positives and negatives. I’m an electrical engineer.
------------------------------------------------------------------------