How do I forward voice mails with the Apple OS6 smart phone?

There isn’t a way to natively forward voicemails. There are a few apps available that allow you to do this but you need to subscribe to them (they basically forward your voicemail from your carrier to their servers).
One way you could forward the message is to dial up your carriers voicemail number and see if there’s an option to forward it from there. It often depends on the carrier sypportjng this feature but I would have thought most major carriers would.

Thank you @Lightlyseared. I have never come across a phone where you couldn’t forward a voice mail. It doesn’t make any sense to me.

If nothing else, we’ll just put his phone on speaker and record it to my phone.