Call barring is a way to block calls on your cell phone. It give you the option to bar a number of calls like incoming calls, outgoing calls or international calls. While some phones activate call barring with a password, the T-Mobile Dash does not need one in order to work.
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Click on "Start" from the Home screen. Click on "Settings."
Click on "Phone" and select "Call Barring."
Select the kind of call barring you want to use from the menu, such as "Block Incoming Calls" or "Block Outgoing Calls."
Select what calls you want to block, either "All Calls" or "Calls from a Number." Enter the phone number of calls you want to block, if that is what you chose. Click "Done."