I experianced the same here also. I was using the Boost Juno and it got destroyed, I always had my eye on the Prevail so I didnt pay the account due to not having a working phone due to finances I waited about 1 1/2 to 2 months and got the Prevail and was going to activate the account. To my suprise Boost had activated my account 2 days before I walked in to purchase the Prevail in addition to that my shrinkage DID NOT GO AWAY. I was still eligible for shrinkage after one more payment.
Then just two weeks ago the same happened to my cousin in law she couldnt afford her bill (student with part time job) and Boost activated her account back up out of the blue.
It pays to be a long time Boost customer, this shows they actually want thier customers to stay with them. No other cell company would ever do this, you dont pay and your done period.