Can I put my sim from Zte merit z990g to an iphone 3?

I have a Zte merit z990g, and I just got an iphone 3, I have heard that people can switch their sim card right to an iphone is that possible with this phone and sim card?

Added (1). It is a 3 GS

I've heard that the iphone uses a smaller sim card, but a standard card can be cut to fit.

There's no iPhone 3. Its either the 3G or 3GS.

As far as your question, yes it should be able to work assuming both phones are locked to the same network or both are unlocked.

To clarify Alejandro's point, the iPhone 4 & 4S use microSIMs & the iPhone 5 uses nanoSIMs. The original, 3G & 3GS iPhones use miniSIMs which is basically the standard size SIM.