-…and I’ll return your call as soon as possible. I would have answered, but I was already on the phone with Bill Gates—I swear.
I can’t recall the last time I used a Nokia phone—it’s been that long for me, too—but my initial thought is that the best way to preserve this voicemail is to simply record it using

10Hello, this is [your name]. I’m probably at home just avoiding someone I dislike. A funny way of telling someone you’re avoiding them without sounding offensive or having to pick their calls. Please speak very slowly, make it short, make it sweet, and I’ll deliver the message to them. Using other household appliances as stand-ins for the message center is cute and funny. This voicemail will warn callers not to bring drama, so you can save yourself the trouble of having to hear a message that was about to spoil your day.
Of the many things your phone can do, automatically recording a phone call is not one of them. Perhaps not including that feature is a security precaution for phone makers; it could be a potential liability issue. Regardless, from time to time, documenting a call is a useful thing to do, whether you’re conducting a phone interview or cataloging a customer service call.