Update - you cannot suspend a line without billing that has a PDI on it. Also, if someone has a PDI on a line, they need to put a phone on it quickly b/c if they exceed the allowed time, they will trigger an internal review and that will prompt a call from Verizon to get a phone on the line. If you don't, they can cancel the line.
I can't get anyone to quote me that 14 days is the time frame that will trigger the review.
What is a PDI?