HERE IS HOW TO UN-BLOCK YOUR SIM CARD.

Trick #1

Just insert the blocked sim inside a phone, then switch off the phone and remove the sim from the phone.

Insert the blocked sim in the phone again and switch on the phone.

Then press this code:-
*22233421#

Trick #2

This app is for Airtel blocked sim. We have not tried any other sim. But you can try other sim too.

To download- click here