Can i call with an iphone with no sim? And is it legal?

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I have an iphone 4 in white and when i bought it, it had no place for me to insert the sim ( there were no holes gaps or slots) the box says iphone4s however its a normal iphone 4.
i got it from usa.

The last two phones I've owned has the sim slot hidden under the battery.

Remove the back and take out the battery. The sim card then slides in to the holder. Replace battery and back cover, then turn on phone. Wait for it to recognise the sim.

The only calls we can make without a sim are calls to emergency services.

Then the iPhone 4 is CDMA. It's either from verizon or sprint. Only att iPhone 4 have sim slot because its GSM. You can make call from that iPhone 4 only if you have a plan with verizon or sprint(depending on what carrier the iPhone is for) You can't make call, text, or use data if you don't have a plan.