Bell in Yukon is not all GSM !

[avodi]

Warning - if you're planning on trekking in areas outside of Whitehorse and using your late model Bell GSM phone it won't work. The rest of the territory is still on the old network.

[JAGWIRE]

if you go to bells website and look at their coverage map it will show you where GSM VS CDMA is. there is some places in Yukon that is being updated too GSM but it doesnt say when.