iPhone 6 Plus, 4.5G desteklemektedir. 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), 13(700), 17(700), 18(800), 19(800), 20(800), 25(1900), 26(850), 28(700), 29(700) - A1522 GSM, A1522 CDMALTE band 1(2100), 2(1900), 3(1800), 4(1700/2100), 5(850), 7(2600), 8(900), 13(700), 17(700), 18(800), 19(800), 20(800), 25(1900), 26(850), 28(700), 29(700), 38(2600), 39(1900), 40(2300), 41(2500) - A1524HızHSPA 42.2/5.76 Mbps, LTE Cat4 150/50 Mbps, EV-DO Rev.A 3.1 Mbps