Flashing without network (Sprint) coverage

[mtnbiker]

We are currently vacationing where there is absolutely no cell service (no Sprint, no roaming, no nothing). Before we left home, I was working on learning how to develop my own ROMs. So my question is, what is the implication of flashing a new ROM when there is no coverage. It will be a couple of weeks before we get back into a Sprint area again, but possibly sooner for a non-Sprint signal. Will I be able to use the phone when roaming after a flash? Not sure what provisioning is done by Sprint when the phone boots the first time. Anybody have any experience with this?