[ChrisH09]

It shouldn't matter weather or not it has the trial account attached to it...when you call up Sprint just tell them you purchased the phone from a person that was at the Google I/O conference...and they should be able to change the ESN to your account, then add the $10 fee. The only problem I forsee is you trying to activate it on your account before June 4th, Sprint may not have stuff set up "Live" yet for the Evo 4G, example ($10 fee on there CS system)...so until them you may be out of luck...otherwise you should be good to go.

Best bet is to call them up and see if it possible to activate it on your account before the 4th...the worst they could say is "No".