Use a landline phone with an iPhone?

Hi, so I want to buy this old landline phone for my friend that she's obsessed with (hamburger phone from Juno).Is it possible to link this phone with her iPhone somehow? Is there a way with Bluetooth or an adapter or something? Please let me know thanks

If she has land line service she could call forward her iPhone to that line, but no way to link her iPhone to it even if she has something like AT&T's wireless home phone service.