... you send out follow-up emailsduring the wait period to POIs you have already skyped with, just to remind them about yourself and reiterating how excited you are for the possibility to work with them. One of them responds, and at first you are really excited, thinking how nice for them to write back - but then you open the message and it says "I am not sure I can respond for the "certain school name" PhD Program. At "other school name" we have just started reviewing our applications."
YIKES! I had to send out a really apologetic response. I hope that didn't screw things up too much