If I know you well enough that your call might be important I've told you before:
"Don't leave voicemail. I get too many that are a waste of time to bother sorting through them. If it's important text that it's important and I'll call back when I can. If not I'll see you called and get back eventually."
If I haven't had that conversation with you I really don't give a care if you ever get a hold of me.
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