The default voicemail greeting on the iPhone plays generic Your call has been forward to an automated voice message system recording. If you use your phone for work, create a personalized greeting that tells people you’re a professional.
Use call answering rules to determine what happens when a caller reaches your voice mail. For example, if you have automatic replies turned on, then you could set up your rule to transfer the caller to a different number. If you have multiple rules, you can specify the order in which they are applied.

Forget about messing around with apps. There’s a powerful voicemail handling system built into nearly every big carrier today — and that system almost always includes a system for recording a voice message and sending it directly without ringing the target phone. I will walk you through the process of doing this on Straight Talk (since that happens to be my carrier) but most carriers will have similar systems.
Recent trends in voicemail have leaned towards the desire for many individuals to relate on other forms of digital message than traditional voice mails. More individuals have not set up their voice message nor return calls in a decent amount of time. However, some voice messages even steer individuals to contact by email for a quicker response. If you still enjoy the concept and position that a voicemail box serves, you may feel compelled to add a witty voicemail greeting to your caller. The following selection has been shared by others around the global and intended to inspire you to create your own unique humorous voicemail.