Root If I flashed back to Cricket...

manually, would my phone automatically be activated? It is already currently active on Cricket but I need to sbf to get back to Liberty... so I guess what I am asking is, would any other work be required before I can use my phone after the flash?

Also, I can't find the prl that my phone currently has anywhere... probably a very noobish question, but if I dial *228 will it update it to the one I currently have?