How do I lock my SIM?
Locking your SIM means a PIN will be needed each time you restart or if it’s placed in another device.
You can lock your SIM in your device’s settings menu:
Android
In the settings menu, select the More tab and choose Security
Select Set up SIM card lock
Select Lock SIM card
Finally, enter your chosen PIN
Your SIM will now be locked
iPhone
In the settings menu, select Phone
Select SIM PIN
Press the switch to activate your SIM PIN
Finally, enter your chosen PIN
Your SIM will now be locked
Please note: the default PIN on all Vodafone SIM cards is 0000.