Your message is a period of time that they are forced to wait through in order to do what they called to do in the first place — relay information to you.
8. “Thanks for calling [your name] at [your company]. I didn’t mean to send you to voicemail but I am either on the line with another client or on the go. Leave your name, number, the reason for your call today and the best time to call you back. I’ll speak with you shortly! ” Your caller probably wanted to reach you, not your voicemail. Advise your caller that you’re simply on the line with another caller and you’ll be right with them.

Users often don’t invest enough time into their messages, resulting in incomplete, unprofessional, or otherwise under-whelming greetings. Sure, crafting a greeting doesn’t sound all that complicated; however, there are a number of pitfalls users can fall into—i.e. informality, terseness, sincerity, lack of direction, and more. While none of these sound too catastrophic, they are often interrelated. As such, they tend to worsen any problem. For example, humor can cause informality, worsen ambiguity, and weaken sincerity. That being said, users should strive to avoid ALL these pitfalls.
Cell phone voicemail greetings are generally more personal and casual than office phones. Consider a greeting like “Hello, you’ve reached [your name]’s cell phone. I can’t take your call at the moment, but if you leave a brief message, I’ll get back to you as quickly as possible.”