The one plus used to be good for that, but we're taken over. Trying to do it with a one plus nord 200 5g. Need to back it up to android 11 first because 12 has so many issues. Then ask them to give me the key for the bootloader which takes a week. Then root it. Might take me a while but can keep you posted.
Actually think the issue with n71 is a mvno network restriction. Will try to get a real T-Mobile sim and test it (T-Mobile has not seen fit to move my billing off Sprint nor light up fully upgraded tower for 18 months. Grrr.)
Are there any devices on which NSG will lock 5G-NR? Doesn't offer the option on my Moto One 5G Aces or on my (now dead) One Plus N10 5G.
And I didn't think the Snapdragon Samsungs could be rooted.