[Android] Help , registration WP developers must bind a credit card account it?

Some cameras have got used to the project , need a real machine debugging , you should really unlock ( jailbreak ) to install third-party applications to do their own , before my lumia920 students jailbreak too , is looking for edu -mail to registered students developers now does not seem to student users entrance , I can get through dreamspark student discount codes that , when is paying $ 0, but must bind a credit card ... there is no way a credit card does not bind ? Seek guidance ~
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of course
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do a card chant.