For the sake of compilation, here are the 21 ridings tallied so far in which there are allegations or reports of suspicious calls related to polling stations.

Windsor-Tecumseh, Mount Royal, Lac-Saint-Louis, Edmonton Centre, Kingston and the Islands, Hamilton East-Stoney Creek, Windsor West, Sarnia-Lambton, Prince George-Peace River, Guelph, Kitchener Centre, Kitchener-Conestoga, Kitchener-Waterloo, London West, Parkdale-High Park, Nipissing-Timiskaming, Elmwood-Transcona, Winnipeg South Centre, Sydney-Victoria, Saanich-Gulf Islands and Pierrefonds-Dollard

Sourcing for this list can be found here, here, here, here, here, here, here and here.