I agree. Giving him you number should be fine. But I personally would not visit without talking to him about it. For starters, it might make him uncomfortable. But also, some prisons require that you be listed on a visitation list in order to go see him. I don't know the rules at that prison but it was be very disappointing if you went there only to find out that you could not see him because you weren't on his visitation list. So definitely discuss it with him before you go.

Will