Hi. I was finally able to unlock my phone via the device unlock app. Everything works fine except 4g advanced. My carrier here(Vodafone Al) says its advanced lte runs on 1800 and 2600mHz frequencies. But according to gsm arena this type of the s6 supports lte band 7(2600 and lte band 3(1800) im sure theres 4g advanced signal here where i live. Just flashed a custom rom and still didnt get lte advanced signal. I see no 4G+ signal icon and still the same internet speed. What should i do.