The business answering machine greeting you use should be fairly short and to the point, though you can use it as a way to demonstrate what your business has to offer. Your overall tone in the message should be professional and indicate to callers that though their call has been missed at that moment, they are important and you plan on contacting them as soon as possible. Within this, however, you should not indicate that you are talking to someone more important than the caller. Your business answering machine greeting should also be customized in any way you deem appropriate for your business and needs. Jotting down the greeting will prevent mistakes when recording it.
Education Details: Hello, this is (your name). I’m sorry but you’ve reached my old number. Call me on (your new number) and I will try to take your call. If you can’t reach me there as well, leave me your name, number, and reason for call. Thank you. These were just some ideas for voicemail greeting.

On the Phone tab, click the voicemail icon below the dial pad, and then click Change Greetings. Skype for Business calls your voicemail and guides you to record a personal greeting.
If you are alright with your prospects reaching out to you after work, then share your contact details will help them to reach out to you. This is not a mandatory technique, but if you believe that you can cater to prospects after your working hours then this technique is great to conduct.