If somebody you call does not answer, don't just hang up.

Leave a voicemail message.

Don't assume they'll check their missed calls, recognize your phone number, and call you back.

1. Many people don't bother checking missed calls because most are from telemarketers, and they have no desire to talk to those folks.

2. The person may not recognize your number (even if you think they should).

3. And, if they do call you back and you then ask for information about something, they may have to research your query and call you again. You will have wasted their time.

So, always leave a message and tell why you called.