It works similar to the old answering machine, with the only difference is that the old answering machine will store the voice message in the machine itself, while your phone’s voicemail system will store the voicemail in your service provider server. You can also forward the voicemail message to someone else’s mailbox.
Once you have your message, you need to actually record it. The exact process varies depending on whether you’re using a cell phone or office phone, but here’s the basic process: Press the voicemail button, or press and hold 1 on most cell phones. Enter your password. Record your message. Listen to the message you just recorded. Follow the prompts to save your message. Following Up on Voicemail Messages

I’ve got you covered. I’ve compiled some of the best voicemail greetings you can use for virtually any situation you’ll come across.
Recording voicemail greetings for your business or personal life requires a separate list of priorities, because they are being used for two distinct purposes and will be heard by two very different types of callers. I have a friend with two cell phones - one for work, and one for personal calls - and if you call both lines, you would never know it's the same person. While the message on his personal line might not be ideal, he took the time to record a professional voicemail message for his business phone, which makes it stand out.