About call blocking
You can block all incoming calls or block incoming calls only when you roam to another wireless network.
You can also block all outgoing calls and all outgoing international calls, or you can block outgoing international calls only when you roam to another wireless network.
To use the blocked calling feature, your wireless service provider must set up your SIM card for this service and provide you with a call blocking password. Depending on your wireless service provider and wireless network, this feature might not be supported.