Wow, I got a response back from a D3 coach as follows...
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There haven't been any changes to the DIII contact rules recently and the reason you couldn't find anything in the manual is because DIII coaches are allowed to contact prospects via phone at any time.
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There is no way this was the rule a year or two ago, so I have no idea when it changed. It used to be something like phone calls were allowed at completion of junior year.
I checked the College bound student athlete manual
http://www.ncaa.org/library/general/cbsa/2004-05/2004-05_cbsa.pdfand sure enough on page 29 it says there are no restrictions as to how many calls can be placed or when they can be made.
Perhaps they assume no D3 program has the money or desire to harrass an athlete with phone calls.