Hello, I have a Samsung Note 8, really good phone. When i bought i did not know that is the uk version (i'm from Romania). I can make/receive a call and if it works i'm not hearing the other person or they don't hear me. The internet works ok but poor signal like all the time. I changed sim cards with other peopla and i think it's from the phone not the operator, no volte option. Is there anything i can do about this? and for android update to 9 or 10 the only way is rooting?