if your on the blackberry plan most likely your gonna have to do both changes at the same time ( your plan & phone).
Also in re: to what phone to tell them that you have thats already answered in the guide in the first post of this thread.
If the website is allowing to update ESN# changes then you might be able to do both there without having to call
Nice, when i recieve the phone i will give it a shot and let you guys know if it works. i know it allows for ESN changes, just dont know if its gonna have a phone selection on the next page. the phone i am recieving has been on the boost network before also.