What do you mean? Basically all new Samsung phones are supposed to get at least 4 years of security updates, with flagships even getting 5 years. Fairphone is still miles ahead, but Samsung definitely isn’t doing badly in this regard.
You might consider 3D printing a bumper case and then taping it inside some universal flip case:
https://www.prusaprinters.org/cs/search/all?q=fairphone%204