“Keep your voicemail messages short, sweet, and snappy," advises Will Craig, Managing Director of LeaseFetcher. "Don’t try and go into the nitty gritty details of the discussion you’d like to have with them—save that for your actual chat. Alternatively, don’t leave them in the dark about what you want to talk about either. A simple 20-second voicemail letting them know the nature of your query will suffice."
Leaving ambiguous voicemail messages almost guarantees that you will not get all you could have from the conversation, as you did not give the person you called the opportunity to prepare for your call.

Sample Voicemail Message #1: Note: The best voicemail message you can leave is one with a specific purpose that addresses the needs of your prospect or client, and offers them a solution that is worth them taking the time to call you back to learn more about. Here is the classic template – adjust and adapt it to fit your product or service.
Open your device’s Phone app ​.At the top right, tap More .Tap Settings. Voicemail.You can: Change what handles your voicemails: Tap Advanced Service. Set up your voice mailbox: Tap Advanced Setup. Change your notification settings: Tap Notifications.