Amazon.com: P and R Galaxy S21 / S21 Plus / S21 Ultra Dual SIM Card Tray Holder Slot Replacement Parts for Samsung Galaxy S21 S21+ Plus S21 Ultra 5G + Type C
How to Insert Dual SIM Card Samsung Galaxy S21, Plus and Ultra 5G Tutorial - YouTube
How to install SIM cards in the S21, S21+ and S21 Ultra - Samsung Community
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