If you persistently can’t save your greeting, you may need to reset your phone’s network settings. The iPhone needs to access your network’s data connection to save changes to your voice mail configuration, and if it can’t connect to 3G or 4G, it won’t save the changes. Start the Google Voice app. Tap the three horizontal lines at the top left of the screen (sometimes called a hamburger menu), and then tap “Settings.” In the Voicemail section, tap “Voicemail greeting.” Tap “Record a greeting.” How do I access my voicemail? To call your voicemail on an Android phone, simply open your phone’s dial pad and hold your finger down on the “1” key. You can also call your voicemail from a different phone by calling your own number and tapping the pound key. How do you check your voicemail?
To clear any customers doubts or expectations, make sure to mention on your voicemail when you’ll be available. Don’t say that you will “try” to return their call. Instead, offer them a realistic timeframe in which they can expect their call to be returned, so they know what to expect - whether it will take you 24 hours or a week to get back to them. This will eliminate your customer’s worries about your timeliness and encourage them to wait for your reply instead of heading over to your competitors.

When was the last time you checked your voicemail for missed messages and paid attention to your greeting? If you’ve activated your Voice over Internet Protocol (VoIP) phone’s voicemail transcription feature for convenience, chances are it’s been ages since you last listened to your voicemail greeting. So it's probably time that you took the time to update it for your callers.
Prepare yourself using the ultimate voicemail script that’s always successful, then derive short queues for yourself to keep the voicemail on track.