Apple announced the forthcoming release of iOS 8 today, coming this fall. One of the new features is wifi calling – where you can make voice calls and send SMS messages over a wifi connection instead of the cellular network. This would be a great feature to have in areas where cell signal is weak or nonexistent, but wifi is available. For example, at home I am in a weak Telus area (most of the time I cannot sustain a clear call for more than a few seconds at a time), but obviously I have great wifi through my home network.
T-Mobile in the US has already announced support for wifi calling when iOS 8 is publicly released. I suggest Telus consider doing the same.