Bought an iPhone yesterday, and i'm STILL waiting for it to be activated. This is pissing me off. I already was an AT&T Customer, so I don't know what the problem is. Now, I hear people saying if I replace the sim card on the iPhone, it should activate quicker. Can I place my Samsung Blackjack Sim card into my iPhone and try activating it? I'm afraid I might get billed twice if both sim cards are activated.