how to enter service mode and change band setting and maybe someone smart to sim unlock
i already paid to unlock my sim,so i cant test unlocking sim.
hit menu and back
menu>key input...Q , OK
AFTER FEW SECONDS YOU WILL ENTER MAIN MENU WHERE YOU CAN CHANGE ALL KIND OF SETTING.
i did find how to activate CA
ue setting>setting>protocal>as>release version>lte 3gpp rel/ca control