Do keep in mind that anything out of the ordinary, or too long will eventually grate on the person listening. My sister recorded a message similar to the one on the film Terminator, where the message says "Hello" and then pauses so that the person on the other end thinks that they are talking to a real person, before revealing that it was a trick.
Follow the instructions and press that number. You will be asked to delete your current Voicemail greeting. Click on the ‘Yes’ button that appears on the screen if you want to remove that. You can save your new recorded Voicemail greeting or can use the default recorded option. From the home screen, select the Phone app. Note: Alternately, you can set up voicemail by selecting the Phone app then selecting and holding the 1 key. Select Keypad, then select the Visual Voicemail icon. Select Start. Select Ok. From any Home screen, tap the Menu key. Tap Settings. Tap Call settings. Tap Voicemail. Tap Voicemail again. View the voicemail number. Press and hold the 1 on your device’s dial pad to call and connect to your voicemail. Press the star * key to access the main menu. Press 4 to access the mailbox options. Press 7 to change the language of the voicemail prompts to either Spanish or English.

2. General Voicemail Forwarding. Thank you for calling [Company Name]. We’re sorry—it seems you’ve called outside of our regular business hours, which are 8:00 a.m.
When you frequently update your business greeting, there is a chance more people will listen to the message. You can update your voicemail with relevant information about your business as a way to keep your customers well informed.