If they already know you, you don't need to say anything of the sort because they can see you. People sometimes say "Hello, it's me" in that case. If they do not know you, "this is" would sound strange, now that you mention it.
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If they already know you, you don't need to say anything of the sort because they can see you. People sometimes say "Hello, it's me" in that case. If they do not know you, "this is" would sound strange, now that you mention it. "Hello, my name is" would be usual, I guess.