[imnuts]

You can't. You would need to get Sprint to add the ESN to their database, which they won't do. The same is also true if you wanted to have a Sprint phone on VZW, they pretty much won't add the device to their system so you could connect, so buy a phone that is from the provider you want to use. This has also been discussed several times in several threads, not sure how you didn't find it.