Did I understand it properly or did you just say you are teaching through the telephone? I cannot imagine that it is professional work, teaching someone you do not know, or see through the phone. I consider it strange. And how about the people you are referring to on the phone? do you know them? or see them somehow? And what about the payments? I cannot imagine how you might get paid for teaching on the phone. That definitely does not sound very professional to me, actually, it sounds like being a big rip-off.