Some Galaxy S21 units only support NFC terminals for Samsung Pay, MST is getting phased out

Some Galaxy S21, S21+ and S21 Ultra units don't uphold MST for Samsung Pay. It would appear that accessibility of the component shifts by country – some get it, others don't, and not such that bodes well. 

MST permits the telephone to work with retail location terminals that lone help outdated attractive stripe cards. This is serious in the US where such terminals are very normal, less so in areas where NFC terminals are bountiful. 

Sadly, the S21 telephones sold in the US are in the gathering that doesn't have MST. Telephones sold in the UK do have it. Is this due to the diverse chipsets (Snapdragon in the US, Exynos in Europe)? 

That doesn't appear to be the situation. The spec sheets from the French, Italian and German public statements make no notice of MST. The Dutch one records MST, as does the Polish, Russian and Indian public statements. 

Here is Samsung's assertion on the issue when asked by XDA: 

Because of the fast appropriation of close to handle correspondence (NFC) innovation by customers and organizations, starting with gadgets dispatched in 2021, Samsung Pay will zero in its help on NFC exchanges, across the Galaxy portfolio. While future gadgets will at this point do exclude attractive stripe innovation (MST), clients with past, viable Galaxy gadgets will have the option to keep utilizing Samsung Pay, including MST. 

MST was presented with the Galaxy S6 in 2015 and has been a staple of top of the line Galaxys from that point onward. Presently it has all mental energy invested anywhere but here.