How to turn off calling on iPhone 4? (read description)?

I'm going to DC for school and we "can't bring our cell phones." The only way we'd be able to bring one is saying that you use it as an iPod and you can't call or text on it. The way he checks this is by calling his phone off of our phone. So that's why I need to temporally turn it off for only a few minutes.
Please don't say:
"airplane mode"
"take out the sim" (I have an iPhone 4, the non GSM one, so it doesn't have a sim slot)
"put it in your bra" (the teacher literally said "We go through metal detectors, so girls, if you're thinking about putting it in your bra, or boys, if you're thinking about putting it in your pants, you're out of luck."
Please Help ME
thank you.

Added (1). I forgot to mention about the airplane mode, he'll be able to see the plane where the carrier is supposed to be haha

What's wrong with airplane mode? You can turn it off later, duh.

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