If you don't have an affordable roaming agreement, you might be best of banning your phone from roaming or simply switch data off. Otherwise it might prove costly. Seems that the signal from Russian networks at places are stronger, so your phone would find it tempting to connect to them. You might not.
나만 알고 있는 정보가 있다면 로그인하여 다른 모험가에게 도움이 될 만한 팁을 추가해보세요!