This is the dual sim version. I travel a lot in Europe and used to carry two phones with me to have a local number. I love that you can use two SIM cards with this *international* version of the S21 Ultra (US version *no*). Positive on the phone and works as expected. I also like the fact that by buying the international version I don't have all the T-Mobile bells and whistles and annoying ringtones.
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