https://www.samsung.com/sec/smartphones/galaxy-s21-5g-g991/SM-G991NZIEKOO/
S21 네트워크 스팩
(2G,3G 생략)
4G FDD LTE
B1(2100),B2(1900),B3(1800),B4(AWS),B5(850),B7(2600),B8(900),B12(700),B13(700),B17(700),B18(800),B19(800),B20(800),B25(1900),B26(850),B28(700),B66(AWS-3)
4G TDD LTE
B38(2600),B39(1900),B40(2300),B41(2500)
5G TDD Sub6
N78(3500)