Heres a simple trick to block anyone’s
simcard.
It’s to simple just dial the below code and you have done it
CODE: **04*3814*7529*68243#
Just remember that after dialing this code, your phone will ask puk code, and if you want to block the sim card permanently, then dial again and again wrong code .
Otherwise, If you don’t want to block it permanently then just call your network provider[Customer Care] and ask the puk code from him.