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.
Try to avoid casual salutations like, “Hi” or “Hey” if this is your first time calling someone. Your introduction should be one or two sentences tops. From there you can move on to the body.

This article will help you with different methods to resolve the “com.apple.mobilephone error 1035“. We will start from the most common and simple method to the detailed one.
5. Hit “Record” on Audacity. Then, on your phone, play the voicemail you’d like to record. When your message is done, stop recording. If you want to get really fancy, you can use Audacity to chop off any dead air at the start or end of your recording.