Avoid telling your prospect what to do. You'll make returning your call seem like a chore or, worse, a demand. This should feel like a mutually beneficial relationship -- one in which each party wants to call the other back -- unprompted.
Most importantly, have fun with it. If you don’t enjoy leaving a voicemail, you might not be in the right job. Voicemails can add value, whether or not a prospect calls you back right away. Even if it triggers an email response or call-back six months down the line, it’s valuable. The better your voicemails, the more likely you’ll get a response. This article was originally published on Hubspot. It has been republished here with permission.

Great question! Although I don’t know if there is a specific function for this on your particular phone, the best way to save the message is the simplest. Turn up the sound as high as you can and record it onto a digital recorder (like you would use for a lecture), a cassette recorder or your cell phone if you have a voice recorder on it. Then save it as an MP3 on to your computer for safe keeping. You can also Google your vtech model number to see if you can find an owner’s manual. They might have a way to save a recording in there. Probably not, but it’s worth a shot.
Navigate to Settings → General → Reset → Reset Network Settings → Enter your password → Reset Network Settings.