additionally relying on specific applications / services that can relatively easy singled out with DPI and by that also stick out their users for "further inspection".
With DPI hardware having dropped substantially in price while at the same time expanded functionality, TelCom providers / gov. agencies can relatively easily / quickly deploy such censorship / surveillance at the edge or in the TelCom core.
Their suggestion to use TOR does not really help - Turkey for example has today started to block TOR ( http://www.bbc.co.uk/news/technology-38365564 ).
With DPI hardware having dropped substantially in price while at the same time expanded functionality, TelCom providers / gov. agencies can relatively easily / quickly deploy such censorship / surveillance at the edge or in the TelCom core.