i am working on a mobile verification code wher user can enter his email and his mobile number.then code has to be send to his mobile number,by that code user can login to site.

how to achive this target.

With his cell # and the cell phone provider you can send an email that will go to the phone. There have been lots of posts on this topic. You can start with these:
http://www.daniweb.com/forums/search10163832.html

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