A simple manipulation allowing you to block unwanted calls and SMS on your Windows Phone 8 device:
Enable call blocking:
Swipe the StartScreen from the left edge to the right and go to Settings.
Tap on "call+SMS filter".
Enable "Block call+SMS".
To block a contact:
Open the call list of your Windows Phone 8 device.
Press and hold the number you want to block for a couple of seconds.
A small menu shall be displayed, select the "Block number" option.
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