How do I delete all data from the SIM card of a Samsung Propel a767?

I recently got a used Samsung Propel a767 and things such as the text messages of the previous owner are stored on the phone. Is there a way to delete all data on the SIM card?How do I delete all data from the SIM card of a Samsung Propel a767?
To delete text messages, go into Messages and select the mailbox you want to delete. Go to Options, Delete, All. Repeat for any other mailboxes where you want to delete messages.



To delete other items like ring tones, music, etc. go to Media and navigate to the folders where you want to delete items.