Honestly, you don't need the board here to tell you when to blow your nose. When you feel a sneeze coming on, you pull out your handkerchef or kleenux and do what comes natural.
None of us can possibly know why he gave his cell phone number
Scenario A - poster here convinces you it is not real so you give up and don't call. Only problem is it was real - duh!
Scenario B - you call. Coach tells you he needs to see your player before making a decision on him. Offers camp invite.
Scenario C - Coach says he has seen your son play and describes him to a T. Says he would like to see him at the camp but they are highly interested.
Seems like it would be pretty useful information to hear what the Coach has to say. Not sure how any of us can provide anything useful - i.e., help you read between the lines
Reading between the lines makes no sense to me. If you want to go unrecruited, don't return phone calls like this. I can almost guarantee the coach will tell you something useful - regardless if he wants to recruit your son or not. For example, he might say we are not really recruiting middle infielders this year but I know Coach B would be highly interested. Or... he might say what your son needs to do to get recruited at a place like that. Seems to me that type of information would be highly useful. You can't get it from us and you most certainly can't get it by letting one of us talk you out of calling.
Get off your duff and call and don't be afraid of your own shadow