It's not the functionality of Samsung Pay that as at issue. When set up, it works anywhere that contactless payments are accepted, just as Google Pay does. The problem with Samsung Pay is the very small number of UK banks that work with it. (I don't know about other countries) I am fortunate in that my bank, First Direct (HSBC) does support it but none of my other bank or Credit card accounts does.
Samsung either needs to urgently work with the banks to get Samsung Pay more widely available or they must make the Google Pay app available for all their watches. I bought my 46mm Samsung watch specifically to be compatible with my S8 phone, but I'm seriously thinking of dumping this expensive watch in favour of a watch that does support Google Pay.
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