Coaches do not send personalized camp invitations to their camps with a phone number requesting you call off a blind email. The program sends a form letter that looks very personalized. My dog once received what looked like a personalized camp invite after I filled out an online recruiting form in his name. I was trying to prove a point to a parent who thought their potential D2 prospect son was being recruited by one of the top D1 programs in the country.
If the coach has seen the player perform, he’s impressed and then the player makes contacts the coach might provide his phone number. If the player is previously recommended as a “must see” by a reliable baseball contact the coach might include his phone number. If the player is a huge local name the coach may be aware of him and provide his phone number.
But coaches do not provide their phone number to blind contacts.