Voicemails need to maintain a professional consistency that’s aligned with the entity it’s representing. That said, the structure can vary depending on the situation. There’s no template set in stone. In fact, trite and generic should be off the table. The goal should be a balance of uniqueness and practicality.
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.

Reassuring the caller that they contacted the correct number or reached the person they intended helps reduce the number of hang-ups and wasted messages you’ll receive. Here are a few notes on how to leave the best greeting possible, along with some voicemail message examples you can use in your own company!
Under Additional Settings, choose one or both of the following: Select the Transfer to '0' to phone number check box, and enter the phone number to which callers will be transferred.