Anonymous wrote:I think it's assumed you don't need to call back to happy birthday calls.
Right? It's not like you asked them a question and needed an answer. You wanted to send them good wishes on their birthday; you did. Communication successful! Do you expect a thank-you note for a birthday card, too? It's certainly nice if someone calls you back, because presumably you like this person and would enjoy talking to them, but maybe they were busy--at work, doing stuff around the house, or, I don't know, out celebrating their birthday? If I am close enough to someone that I make the effort to call them on their birthday, I would imagine it's someone I talk to fairly regularly, and I wouldn't expect a special phone call just to acknowledge my message.