I have a quick question regarding activation v. hacktivation of the iPhone 3GS. Essentially, I ordered an iPhone 3GS from AT&T today as I became eligible for the handset discount. However, as I am currently living in Belgium, I will want to jailbreak and then unlock the iPhone (after le boyfriend brings it over to Europe when he visits in a few weeks) so that I can use it with my Belgian carrier. I think I've gotten a good handle on the overall process, and plan to use blackra1n and blacksn0w, respectively. However, should I activate the iPhone with my AT&T SIM card before I jailbreak the iPhone? Or, should I "hacktivate" the iPhone with blackra1n? Is there a practical difference between the two? If, after I return to the US, I want to roll back the jailbreaking and just use the iPhone like I got it from the factory on AT&T's network, how would a hacktivation affect my ability to do so? Thanks for all the help in advance. I'm excited to finally take the iPhone plunge!