Hi new to hear so hope someone can help. I'm visiting the philippines and have fb and fb messenger on s7 edge. I using a pocket wifi by one of the local networks called Smart at first I could call family etc on fb messenger. But now keep getting warning message about "standard data charges" "calls are free over wifi". I know that that's why I have the pocket wifi, which is connected icon in corner. I have checked my setting and all seem fine has anyone any idea ?