No Hello
Saying only "Hello" and waiting forces the other person to stop what they're doing and reply before you even ask your question. It wastes both people's time. Ask your question upfront — the other person can answer when they're free, and everyone gets more done.
No Call
An unscheduled call hijacks someone's entire attention — they must stop everything and context-switch immediately. Ask yourself: could this be a message, a document, or an email? If yes, use that instead. Reserve calls for genuinely urgent, complex, or sensitive conversations — and even then, send a heads-up message first.
No Connect
Asking to "connect" with no context forces the other person to accept a call without knowing what it's about — and it often turns out the topic could have been resolved with a single message. Always state your purpose upfront. This lets the other person either answer async immediately, or prepare properly for a call only if one is truly needed.