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1398/4/8 Mi9T
3G Network: HSDPA 850 / 900 / 1700(AWS) / 1900 / 2100

4G Network: LTE band 1(2100), 2(1900), 3(1800), 4(1700/2100), 5(850), 7(2600), 8(900), 20(800), 28(700), 38(2600), 40(2300)

Memory: 64/128 GB, 6 GB RAM

Redmi K20
3G Network: HSDPA 850 / 900 / 1900 / 2100

4G Network: LTE band 1(2100), 3(1800), 5(850), 7(2600), 8(900), 34(2000), 38(2600), 39(1900), 40(2300), 41(2500)

Memory: 256 GB, 8 GB RAM or 64/128 GB, 6 GB RAM

1398/4/8 https://www.gsmarena.com/compare.php3?idPhone1=9738&idPhone2=9720#diff-