When I was still editing The Peninsula's technology supplement (before the inmates took over the asylum), I asked Qtel whether they were limiting bandwidth for specific applications. Here is their response:

Qtel is providing full and equal capacity to all sites, including high-bandwidth file sharing and video sharing sites, and will continue to increase the capacity provided in-line with its ongoing investment in its network.

The only exception to this approach comes in periods of extreme and unusual network strain, such as the challenge created by the breach of the sub-sea Internet cables in December 2008. In these instances, capacity provided to some social streaming sites – such as video sharing websites – will be limited in order to provide maximum capacity to business applications and e-mail. These limitations are lifted as soon as is technically possible. (Full capacity was restored in Qatar on January 6, 2009, in the case of the cable breaks).

Qtel aims to provide full access to customers to enable them to run applications and services as they need them. The company has invested over US$3.2 billion in technology infrastructure for Qatar, as part of the Broadband Qatar strategy, which aims to fast, reliable Internet access at high-speeds for people across Qatar.

I think they are limiting torrent, but it's difficult to design a test. Any suggestions?