CANADA STOCKS-TSX pulls back as telecom, energy shares drop

* TSX down 42.03 points, or 0.28 percent, at 15,172.93 * Six of 10 main index sectors fall * Telus, Rogers among top decliners By John Tilak TORONTO, July 7 (Reuters) - Canada's main stock index fell on Monday, pulled lower by a selloff in telecom providers' shares following news of a new spectrum auction and a drop in the energy sector after oil prices slipped. The Canadian government said it will auction more prime wireless spectrum early next year, with more than half th