I like to say my phone number very early so the person can hear it again quickly by starting the message over and does not have to listen to your entire message again to hear the number. But do repeat your telephone number at the end of the message at least once and speak very s-l-o-w-l-y so the person can write it down as they listen. If you don't get a response to your first voicemail, don't hesitate to record a similar message once a week for two or three weeks. This sounds a bit excessive, but my experience has been that if there is even the slightest chance of meeting someone now or even in the near future, this kind of message will get their attention.
With notifications, you're alerted when you miss a call or receive a voice mail message. You can decide how and when you want to be alerted. For example, you can receive an email when you miss a call or get a text message when someone leaves a voice mail. By default, you'll receive an email anytime you miss a call, but text messaging notifications are turned off.

You also don't want to confuse them with too much technical jargon and complex vocab. Keep things on the lighter side and approach your voicemails conversationally.
2. Press the Star or Pound Key. Depending on your carrier, you will likely push one of these two keys next. It's more common to push the star key. When you hear your voicemail start, that's when you should press either the star (*) or the pound (#) key. For AT&T, Sprint, U.S. Cellular, and T-Mobile, press the star (*) key. Verizon, Bell Mobility and Virgin Mobile users should press the pound (#) key. If you are using a different carrier, you can check its website or call customer service to be sure.