Does anyone know how to clear a pin number on an Xperia (Sony) E1?

[AC Question]

does anyone know how to clear a pin number on EXPERIA (sony) E1

EXPERIA E1 Sony mobile has lost contact with OPTUS service Tower and when the phone came back online it had a lock out pin no in place aaarrrggghhh

 

[B. Diddy]

Welcome to Android Central! I'm not sure how that would be related to losing service temporarily. You didn't have a PIN lockscreen set up before?