At Sprint, a two-year service agreement only means that you will continue service with them (paying your bill) for two years. If you agree to do this, they will sell you your phone at a discounted price. Failure to maintain service for the full two years could result in an "early termination fee", which is usually the extra cost of the phone.
If your phone has been damaged, you need to determine if it's still within the warranty period (usually 1 year) and have it repaired.
-Wolf sends