Using your cell phone to record a voicemail message isn't always easy. Between remembering what to say and getting the right timing, it's tricky. But your phone does have a playback option, and it's easy to listen to and review your message. For some people, though, cutting off the end of a message is a funny way to trick people and catch them off guard. In most situations, callers won't know it's intentional and will think you're far less than tech savvy. Definitely not an impression I'd want to make.
41 Funniest Voicemail Greetings in the World. Many years ago, in a time before cell phones (Yes it exists, and I remember it!) I used to get inundated with phone calls to my landline at all times of day and night.

but I'm doing this NOW, while you're listening to it LATER, except for but whatever you have to say to him, you can tell me. We're VERY close Bwana fella no home now, so you fella leave talkie-talk. Bwana 'im big fella mek talkie-talk back real fas'.
To whom it may concern. You’ve tried to reach Wilbur and Ed. We aren’t here at the moment, but if you want, you can leave your contact information at the tone and one of the brood will get to you shortly. Take care, thanks for the call.