It can be very confusing when there are 3 different models of phone being launched that all bear the Samsung Galaxy S21 name but offer different features and builds.
The following link to the GSMArena site takes you to a comparison of the 3 S21 models and highlights their differences to hopefully help making a choice of which is best for you...
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My device... Galaxy Z Fold5 5G 12/512GB (G946B D/S) CSC EUX. Android 14. One UI 6.1
