Just a word of caution. If you suspend your line without billing - it freezes your contract too. So if you have 17 months left on your contract, when you un-suspend the line, whether it is 3 months or 3 years from now, you will still have 17 months remaining in your contract. The time doesn't tick off of your contract whie the line is suspended.
You may know this already but I thought I would pass it along.