A new setting choice is introduced to One UI 7, you can choose setting that fit your preference. For best mobile internet speed, 5G is preferable. However, LTE (4G) has wider coverage at non-5G area or weaker 5G area. Choose LTE when internet stability is important. Otherwise you may always experience mobile internet line connected but internet still slow/not responding even it's 5G (when 5G weak signal).
