Reading from a note will help you say what you want without any hiccups or interruptions. Call the person and keep your notes in hand. Once you’re in recording mode, read out from the note to sound as professional as possible.
Note: If necessary, delete an existing greeting (limit of 2 greetings) to make room for the new greeting: Tap the Menu key, tap Delete greetings, tap the check box next to the desired greeting, and then tap Delete. Tap the Record icon to record your greeting. Tap the Stop recording icon to stop recording.

While it is a best practice to end your message with your contact information, that is only valuable when the recipient listens to your message until the end. By stating your name and phone number earlier in the message and repeating it at the end, you’ll be able to pass your information along to those who may not initially hear the message in its entirety.
After leaving four or five messages without receiving a response, you should stop calling – at least for now. Don't expect the courtesy of a call back from a hiring authority. Unless they have a need for someone like you, it is not likely that they will call you back. Don't take it personally. If you are looking for a job or soon may be, join Tony Beshara for a FREE webinar: The Top 10 Reasons You Might Have Trouble Finding a Job (and How To Combat Them).