The 5G phone selection story goes like this:
Does a phone have 5G?
If yes, how many 5G( and 4G) bands does it support? and does it have support for 5G mmwave band?
If say 12 or 13 bands, does it support all theses bands in both SA and NSA mode?
If yes, does the phone have very good
carrier aggregation configuration (This is not known until you buy a phone but my observation has been that the more bands a phone supports better are the chances of a good carrier aggregation configuration)?
If yes, can the phone support 5G in both SIM slots simultaneously i.e. 5G Dual SIM Dual standby (DSDS) (or does a phone only support 5G + 4G simultaneously).
If yes can it connect both these SIMs in SA mode or can it only support 1st SIM in SA and 2nd SIM in NSA mode?
If the phone supports 5G SA mode in both SIM slots simultaneously, does the phone support Voice of New Radio (VoNR) in both slots?
If such a filtration is done, you get a phone with the most future proof 5G connectivity
Please take note of the 5G bands auctioned in India i.e. 1,3,8,20,28,40,41,71,(77/78), 258.