My iPhone 4 has the iPhone 4s design?

I bought an iPhone 4 before school started in September, and I was fine, because it's a smartphone and I'm okay with that. But recently, my cousins who are very good with technology noticed that my iPhone 4 had an iPhone 4s design, but with a iPhone 4 model number. Should I call them up to just see what's wrong?

Whut

That made no sense

You probably bought an android by mistake. Android copied the iPhone 4S design, so it would look like a 4S, but their serial numbering system is different, so it might have the same number as the iPhone 4 models.

The two versions are very similar externally.

You can check the model number yourself though:
The GSM iPhone 4 is A1332, the CDMA iPhone 4 is A1349, the global iPhone 4S is A1387, and the China-only iPhone 4S is A1431.

But: if by 4S design, they are referring to the four breaks in the silver band, the CDMA version of the 4 also has four of those breaks.

So my guess is your model number is A1349 and you do have a iPhone 4.

Edit:
Steve is talking out of his 4$$. Android is an operating system, not a phone.

Yeah.