4. Sprint Wireless: Press and hold the “1” button on the dialer screen of your Sprint phone. This command automatically dials into Sprint’s voicemail system.
To receive text message notifications, select Notify me via text message when new voicemail messages are received.

With a voicemail, though, you (should) know exactly who you’re calling – their name, their company’s name, how many employees they have, etc. Your message can be hyper-customized to that one person you’re calling. When you make that message just for them, they’ll feel more of a responsibility to return your call.
Think through what you are going to say before you place the call. When men hear the beep, they often freeze up and forget what they wanted to say. If you want to be the go-to guy at work, then you have to exhibit competence on all levels. Don’t spoil your confident image by hemming and hawing and filling your messages with “uhhhhs,” and “ummmms.” If it’s a really important call, consider writing out what you want to say beforehand. If the person picks up, great, you now have some notes to remember what you wanted to talk about. If they don’t answer, you can leave a clear and concise message.