Restore iphone without service?

Hi, i locked my phone out coz i forgot my password, i want to restore it, but i think it needs activation later, i just wanna know after the restore do i need a sim card wtih service or just a simcard without service coz mines doesn't have service!

Depends which model of iPhone and if you have a phone running off a CDMA network (Version, etc.)
Typically any model above the iPhone 4 should work just fine

I have a iphone 4 16gb white with rogers sim, so it won't work?