The next step is very important and you need to get it right. Say your phone number two times very slowly so the person has enough time to write down your number as they are listening to your message the first time.
You can also use the Slydial app for iOS or Android. Create a free account with the service, then choose a contact through the app or manually enter a phone number. Once the app has connected the call, leave a voicemail, and hang up when you're finished.

That’s why it’s critical that each customer interaction with your business is consistent, positive, and represents the values and personality of your company. This includes your storefront, website, social media presence, emails, and every interaction you have with your customers, both online and in-person.
The bottom line is that a business’s situation is likely to change often and rapidly, each of which need a unique and applicable voicemail greeting to cover the circumstances and timeline. For example, callers shouldn’t reach a business-as-usual voicemail, and therefore expect a return call within the business day, if the subject they’re calling is out on vacation for two weeks. Such a lack of communication is a recipe to lose that caller’s trust and tarnish the brand’s reputation.