While the Windows Phone GDR2 update has made its way onto devices like the Nokia Lumia 925 and the Nokia Lumia 1020, it seems that there are some features in the update that were not found in the phone, although it is possible that they might be carrier-disabled, or they can only be accessed by developers to be used with third-party applications. These features include call and SMS blocking and the APIs for these features were found by developer Walking Cat when he attempted to compared the Windows Phone 8 emulator code to that of the GDR2 emulator code.
The software was found to contain APIs for call and SMS blocking with the ability to filter and block specific numbers, numbers not in your phone book, and even phone calls that come from private numbers. This feature is extended to the SMS messages as well. Unfortunately like we said, these features can’t be found in the Lumia 925 or the Lumia 1020, suggesting that they might have been disabled by carriers, or that they are only accessible by developers. Are call and SMS blocking features you would like to see in your Windows Phone device?