Blocked SIM card will the 3G still work?

I lost my iPhone today after letting 3 network know about it they said that they have to block the sim. I have find my iPhone and find my friends installed on the phone and hope that when it gets switched on ( it got switched off 5 min after I lost it) it will show up on find my phone. But will the 3G work on a blocked sim so that I can locate it?

No. If its connected to Wi-Fi then yes you can locate it.

Since your SIM card is blocked, you have no 3G and can't locate it