Another great thing you can do in your voicemail messages is to leave a few spaces for your prospects to record their message, most of the prospects will do it because they know they will be reached out sooner given the situation of their need.
I can turn off voicemail, but unfortunately that's not a sensible option - I need the NHS and the local gov't to be capable of leaving me messages, and voicemail seems to be the only way they're willing to do that. (I *have* left lectures and supervisions to take a medical call, but I am not always by my phone, so.)

If you use one, your automated phone system is the first point of contact a caller makes with your business. You want to make the best first impression. Instead of a complex series of robotic instructions, choose a friendly, warm voice offering simple phone prompts to guide the caller to the person or information they’re looking for.
Your voicemail greeting on your business telephone system is the very first thing your business associates and clients will hear when calling your company. For the first time callers, probably your potential customers, you only got a chance to provide a great first impression that will be provided by your voicemail greeting message. For the ones who frequently call your company, you would want to make your voicemail greeting prompts as efficient as possible in order for you not to waste your client’s precious time in listening to your whole voicemail greetings every time they make a call.