MONTREAL – Beginning Wednesday, Vidéotron will gradually roll out its residential cable telephone service in the Saguenay-Lac-St-Jean region and Montérégie, mainly in Sorel. This new extension covers more than 90,000 potential households, and means 74% of its basic subs will be passed by its local telephony service, which is well known in the province for its low price of $16.95 a month, which is actually a dollar higher than when it launched in 2005. Videotron is closing in on 300,000 voice customers (it had 227,000 at the end of March), but we will find out this week what the number...