How can I talk clearly to my Dad on his landline phone, with no wi-fi calling?

For some reason can't figure this out on Google, thought I would ask. My elderly father does not have internet, or a cell phone. He only has a landline phone. I only have a cell phone, and strong wi-fi at home, but I get terrible cell reception at home and I do not have a landline. Because I went straight... show more For some reason can't figure this out on Google, thought I would ask.

My elderly father does not have internet, or a cell phone. He only has a landline phone.

I only have a cell phone, and strong wi-fi at home, but I get terrible cell reception at home and I do not have a landline.

Because I went straight from landline to cell phone, I don't know much about VoIP or anything like that. And I have an iPhone 5, which unfortunately does not support wi-fi calling.

What do you think the best solution would be for me to have the clearest conversations with him on his landline. VoIP? or what? thanks.
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