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Hey,I dont think resetting to default factory setting wont let yr phone to send SMS faster.For this,go to the support section of this site,choose yr phone and download SMS accelator. For factory settings' default lock code is:12345. But if y previously set a lock code and now cant remember that,that is another story. Sw upgrade is another factor.Y can upgrade phone's SW by NSC.
Default code is 12345. If you've changed it and forgot about it, then I suggest to format the phone (this will not reset the code, tho). If you don't know how to reset the phone, check the sticky theme on top of this board.