Samsung Galaxy S6'da 4.5G desteği mevcuttur. Ek olarak desteklenen frekanslar ve hızlar şu şekilde:

4G BantlarıLTE band 1(2100), 2(1900), 3(1800), 4(1700/2100), 5(850), 7(2600), 8(900), 12(700), 17(700), 18(800), 19(800), 20(800), 26(850) - G920FLTE band 1(2100), 2(1900), 3(1800), 4(1700/2100), 5(850), 7(2600), 8(900), 12(700), 17(700) - G920TLTE band 1(2100), 2(1900), 3(1800), 4(1700/2100), 5(850), 7(2600), 8(900), 17(700), 20(800) - G920AHızHSPA 42.2/5.76 Mbps, LTE Cat6 300/50 Mbps