Locked out of my Nokia 3120

Yo, can anyone help me?
I unintentionally locked myself out of my Nokia 3120...
Now i can't access it.
It stays at a white screen with only the battery life showing, as well as a text at the top saying, 'SIM card rejected'.
I really need help on this.
Thanx.

I think your sim card or the phone is broken, 'cause if it's locked there should read something else on the screen