sim card not registering

  jack.4 11:52 23 Jul 13
Locked

I have been given a sony experia that was on the 3 network but without a sim card installed. have got a pay as you go sim from 3 network and put it in phone.I am now getting message sim removed & out of service

  Woolwell 16:45 23 Jul 13

Phone may be locked. Suggest you take it to 3 store.

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