Iphone 4s- Charger? Looks different?

We just got a unlocked iPhone 4s, the charger is triangle and it needs a round to flat adapter. Its not like the usual charger the plug folds in. Is this normal?

All iPhone or iPod chargers should be the same

No, that's not normal- where did you get the iPhone from? If you ordered it off some website, there might have been a chance that it got jacked up. I would have just ordered it off of apple.com or by going to their stores, and then gotten the unlock number from your carrier. Many carriers give away the unlock code for free. They will email it to you.