leftofdial if you have an older samsung phone (S8, S9 or S10) you may be able to find an old GearVR unit that attaches and sort of works ok for VR. The GearVR on an S10+ was quite good in it's day and could handle 5K and some 6K VR videos. Samsung and Oculus (now owned by Meta) no longer support these units.
As noted above, the cardboard things were rubbish and would give you a very poor impression of VR.
Quest 2 was a big improvement (and can be found second hand) and of course, Quest 3 is best value for money new, at present.
