How to block your SIM card
Log in to MyBusiness.
Go to the My Services tab.
Select the subscription you want to block the SIM card for – either directly from the list or by searching for the phone number.
Click Manage subscription.
Click Block or unlock SIM card.
Select Block SIM card.
Done! Your SIM card is now blocked.
Don't have access to MyBusiness?
If you don't have access to MyBusiness, you can still block your SIM card. Visit one of our stores with valid ID or contact our customer service, and we'll help you block your SIM card.