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Trick to Block Your Friend Sim Card

Here I am going to share a simple trick for block your enemy sim card,Blocking a sim card is too simple.
What you have to do is just enter the below code in the desired phone:
Entering of above code will ask you to enter the PUK code.To solve this issue just call customer care and get your PUK code.
Note:Entering of invalid PUK will cause permanent blocking of your SIM!

Dont Try if u dont know what u r doing