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i think this is such a cool invention. if you are ever caught in class text all you need to do is out the case on backwards and type numbers in the iphone app calculator. they will most likely believe it for a minute then realize what it is. my friend bought it and he has it on his iphone case on all of the time. he even shows teachers when they are not busy! he got his at the mall. they are around $32 dollars. *picture form source link below*