A friend of mine has a Nexus S on Sprint and, for various reasons, they're terminating his family's service on Spring. He already owns the Nexus S and is considering using a Prepaid plan. I know Virgin Mobile and Boost both use Sprint's towers which means the phone's on those services can use Sprint's cellular technology. His device isn't rooted yet, but I can fix that quite easily. I've heard rumour that it's possible to use a Sprint phone on one of their prepaid services. Has anyone heard of this being possible and if so, are there any guides on how to do it?