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.
Personally, I think Samsung has one of the best ways of dealing with your voicemail. In addition to offering a quick and easy way of acessing your voicemail, Visual Voicemail will let you jump right into the message you want to listen without having to listen to each message until you get there.

If your carrier supports the iPhone voicemail feature, you can retrieve and listen to your voicemail right from within the “Phone” app and call your contacts back by simply tapping their messages. That type of functionality is pretty neat and useful, because it saves you actual time. If not supported by your carrier, you will not be able to see the visual overview of your voicemail inbox and use any of the related features. Tapping the “Voicemail” tab in your “Phone” app will simply call the number associated with your voicemail box. So let’s get going with creating our custom voicemail greeting on iPhone! How to record your own Voicemail on iPhone Phone → Voicemail → Greeting → Custom → Record → Save
At this point, do not insert a new SIM card, or you might lose the voicemails that you saved on your iPhone. (Click to see How to undelete Voicemail from iPhone) 2. Use Automated System to Reset Password (Call 611) Call 611 and enter the wireless number starting with area code. Press 3 to “get help with voicemail.” Press 3 to reset your VM password. Enter the Billing Zip code for your account. In a few seconds, iPhone will prompt you the message "Password Incorrect - Enter Voicemail Password." Enter the last seven digits of the wireless phone number and tap OK.