It is rude to call a person without emailing, texting or DMing first to let them know when you will probably call. (unless it is an emergency of dire urgency)
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It depends on the situation, however I did get a call yesterday from an agency, I was out, so they left a message on the answer phone, problem is I find it really hard to write phone numbers down like this.
If they had e-mailed me too or instead I get back to people much quicker and can say I will be in on X day at between y an z time if you want to call.
