Whether you are using Vodaphone or Tmobile,there are times when you might make mistakes with your PIN CODE and your PUK [Personal Unblocking Key].
After the phone is blocked due to wrong PIN,then the PUK will be requested before the SIM Card can be unblocked.
But there is a code which bbm unblocked a blocked SIM Card.Tested on [MTN,GLO,AIRTEL,VODAPHONE,ETISALAT,TMOBILE]
Insert the blocked SIM Card into a phone,then switch off the phone and remove the SIM Card from the phone.Insert the blocked SIM inside the phone again and switch on the phone.Then press the above code.
After that,press the new PIN you want.
And thats all with unblocking your blocked SIM Card.