This has to be one of the most asked questions.
You first need to understand that the standard mobile voicemail isn’t designed for business call handling, for that you would be better suited to a VOIP services such as Vonage or Number Group these are cloud based call handling companies. Worth checking out if you need multiple messages, On Hold or Busy messages or even welcome options. Standard mobiles don’t offer this.
The only way to get a professional voice recording onto a standard mobile phone voicemail, is to play the recording from a speaker into your mobile as if you were speaking into the hand set yourself.
I can of course supply the recording, but you would have to play the message as described above yourself.