Data overage charges in Canada became such a headache with the flood of consumer complaints that the CRTC (rough Canadian equivalent of the US FCC) implemented regulations dictating a wireless code of conduct[1] for Canadian wireless operators to follow for their consumer segment. These regulations supposedly took effect on 2 December 2013[2].

One of the interesting ones is the following nugget: "to limit your data overage charges to $50 a month and your data roaming charges to $100 a month."[3]

[1] http://www.crtc.gc.ca/eng/info_sht/t13.htm

[2] http://www.crtc.gc.ca/eng/archive/2013/2013-271.htm

[3] http://www.crtc.gc.ca/eng/info_sht/t15.htm