Professional development educator Dr. Ray Lauk sent us this great piece of advice, which he credits to veteran sales trainer Stan Piskorski:
5. Use voicemail on a computer. Download messages to a computer. If you're the Primary Account Holder, you can save your messages from your My-T-Mobile account.

I’m going to ask you to consider something you probably have never given much thought to: your own voicemail greeting. You may call this your outbound greeting or outgoing message. No matter what you call it, this is what callers hear when you don’t answer your phone. Or should I say, it’s what callers are forced to listen to even though they don’t want to.
While missed calls aren’t ideal, you can let your caller know you’re still there for them by having a great voicemail greeting. The best business voicemail greetings let your customers (and potential customers) know why you’re not available and how they can best get in contact with your business. They are also short and to the point. You usually want to keep your greeting between 6 and 24 seconds long so callers don’t hang up halfway through.