AT&T SIM card in unlocked iPhone 4 brings up emergency screen

Okay, so I bought an unlocked iPhone 4 in Canada (where I live)... came down to Florida for a few weeks and decided to pop in an AT&T GoPhone SIM card (pay as you go) after reading/watching the how-to process online. I should also mention that I cut my Rogers SIM card down to a micro SIM manually and had much success, so I cut the AT&T card the very same way; however, when I insert at AT&T SIM card into my iPhone, it switches to the "Slide for Emergency" screen, wanting me to connect to iTunes. In all the videos and walkthroughs I've gone through, no one has had to deal with this problem. Anyone have an idea why this is happening?

No you won't. Unlocking the GSM side of a Sprint phone will let you use carriers in other countries but not domestic carriers.

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