LG G4'ün 4.5G desteği mevcut. Desteklediği frekanslar ve hızlar şu şekilde; 4G bantlarıLTE band 1(2100), 2(1900), 3(1800), 4(1700/2100), 5(850), 7(2600), 8(900), 17(700), 20(800), 28(700) - H815LTE band 1(2100), 3(1800), 4(1700/2100), 5(850), 7(2600), 8(900), 17(700), 20(800), 28(700), 40(2300) - H815TLTE band 4(1700/2100), 7(2600), 17(700) - H815PLTE band 2(1900), 3(1800), 4(1700/2100), 5(850), 7(2600), 12(700) - H811HızLTE Cat6 300/50 Mbps