So, someone put my brothers PIN in wrong 3 times so he had to get the PUK code to fix it.
He thought it was me, so went and did it to mine but he put in the pin 3 times wrong and the PUK 10 times wrong so it was PUK+PIN blocked as opposed to PIN blocked. So I needed a new SIM. I got one, and I can still use the camera and music i got on it and stuff, but it says "Limited Service" on the main menu. I can't make any calls (It comes up "Emergency calls only").

So yeah, I thought it might be more convenient if it worked.
I Googled it, and all I found on there was that I had to "Flash" my phone.
Is there any way I can fix it quick 'n' easy?

take the SIM Card and rub the contacts with your finger try to clean the phones contact and try it again

The quickest way is probably to pay 3 dollars to a professional and not use any of the riscky tricks on the internet..
But thats just me.