Phone calls too much?

So I’ve been dating someone long distance since December. He said he’s not ready for a relationship because he was in a 10 year relationship about a 1.5 years ago. This past weekend I flew into his hometown and had dinner with his parents and met all of his childhood friends.

We see each other every 6-8 weeks. In between visits I would like to talk on the phone. We mostly text. Would it be too much if I ask him to have more phone conversations since he is not ready for a serious relationship? How do I go about this?
Phone calls too much?
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