Hi. Since I got s7edge ,i have been having some really bad network signal. I barely can got 4g with 1 bar,even though i have here good coverage for 4g .however,i have 3g and 2g full signal.With other phones i have had (p10,s7flat,htc one m9) i got full bars LTE+ signal. What could be the problem? I assume network band. I tried changing it on *#0011# but i cannot enter band options. I got sac23 v8 port.