Keep it Brief. Time is money in business, so if your voicemail is long, chances are the caller will simply disengage before the cue to leave a message even sounds. Keep your voicemail short. The most should be around 30 seconds, and even that’s pressing it. We’ve grown into a country where our attention span can last only about 10 seconds in some cases, so keep it short, brief and to the point. Persuade and Engage the Caller. If someone calls your business, they already have an intention. It’s the quality of your voicemail that plays a factor if they consider you a company they’d like to deal with. This is your chance to motivate someone to engage in a meaningful conversation with you. If your voicemail is shoddy, chances are they’ll hang up, or lose motivation to continue the call. In other words, your voice mail must engage and entice someone to the point that they care enough to leave you a message.
These are very funny and interesting conversations. I did not know before an answering app or machine can answer so funny.

9. Outgoing Message with Samuel L. Jackson Treatment. Stephen Colbert asked Samuel L. Jackson to record his infamous voice on his outgoing message recording.
A good cell phone voice mail greeting is clear, courteous and to the point. Enunciate, don't mumble, to make it as easy as possible for those with poor hearing or bad connections to be able to hear your greeting. Be polite, and save swearing for the conversation, if applicable.