Nokia has just updated their extras+info app, adding a new “call+SMS filter” that as the name suggests, allow users to block calls and texts from specific numbers.
Your phone needs to have the GDR2 Update, though. This said update is present on new Nokia Lumia 925s and 1020s, and will be coming to the Telco-variant older WP8 Lumias in the coming weeks.
You can update your extras+info app by going to this link, or by scanning the above QR Code with your Windows Phone.
Here are some screenshots:
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