Best way to get girl's phone number without rejection

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after talking to a girl for about 5 minutes Ill often say "Well its nice to see you, Im going to get back to my friends" she usually say " Nice 2 meet u 2", then just Im turning to walk away I turn back and say " Hey! Do you have email" if she say yes, I take out a pen and paper then say "great write it down for me" and after a while when she is writing, just say "write your number too"