When in the process is it appropriate to call a coach?

If your son is a 2015, the coaches can't call him until July 1st.  Until then, he can call them...but if they don't answer, he can't leave a message and expect a call back...as they aren't allowed.  The organization my son plays for told us that once a coach starts to attach a phone number (either office....or especially cell), he is basically saying it's ok to call him....and if the conversation has been more than "hey, come to a camp" then it's ok to go ahead and call.  You'll get a pretty good idea on that first call if the coach is interested...and if he'd like your son to keep in touch by phone.

Along these same lines, are college coaches able to email back and forth with a HS player (rising Jr. in our case), or are there restrictions on email communication too?  Also, are there any differences on email communications specific to D1, D2 and D3? Son has had a couple of email exchanges with recruiting coordinator asking for summer tournament schedule updates, both were after son sent introductory email expressing general interest in program.

Solyent...this coming Sept 1st is the start of when D1's and D2's can email your son.   Up until then I believe they can only return your emails with general questions/comments....such as schedule request, camp info, etc....nothing specific with regard to your player...or what they think of him.    D3's are pretty much able to do whatever they want with regard to emails...even before July 1st. 

Pretty sure email communcation not related to camps can begin September 1st of the prospective athlete's junior year. 

You are correct....wasn't sure...just asked my son about it.  I corrected my original post

Thanks for the info guys. I had told son not to expect any response back from the emails he sent out, other than maybe some camp info blasts.  So we were both surprised when he got direct responses from recruiting coordinators asking for summer schedule info.  For some reason, I didn't think this was allowed yet.