A SIM PIN protects your SIM card from unauthorized and unintentional communication or internet browsing. Plus, whenever you restart your phone or remove the SIM card, your SIM card will automatically lock, showing Locked SIM in the status bar. To unlock it and restore your access, you’ll need the SIM PIN. What You Should Know about...

A SIM is a tiny card with a big job! It stores your data and phone number and carries a unique identification number that links you to a specific mobile phone company. (Your text messages are not stored on your SIM and will not be transferred from your old phone.) Without a SIM card inside your...