Visible

I just signed up and I thought all was well.Now when I try to make a call on my iphone I get this message:"ENTER PUKYour sim cannot be accessed. Please call your carrir to obtain your PUK code" Could I get help here!?

I am new to visible.I am receiving this error message: unlock Your Sims. Primary PUK Locked.Then it says Enter PUK for Primary.I need my PUK number