>>212not a ham, so I don't have experience, but from what I've read…
UHF and VHF repeater stations sometimes have a feature called autopatch, which would allow you to make phone calls if you have a radio that can produce touch tone phone key tones.
whether your local repeaters have this feature or not is up to you to research, as are the repeater station's rules for using the autopatch system.
also, bear in mind that your calls are going to be half duplex, so you'll need to make sure your call receiver knows this and what it implies for conversation flow.
other than that, I'd deferr to a real ham who actually knows what he's talking about