Hello from a fellow Canadian. :-)
A few quick points:
- GSM *is* digital
- The benefit of an unlocked phone is that you can actually use it. ;-) A locked phone means it only works on one network - you'll need an unlocked phone to use it here in Canada.
- I don't know what system Sasktel uses, but Rogers is GSM so you'd need a voice + GPRS data account with them
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Tek 'n Toys is our site partner, and they're based out of Calgary. The Smartphones they sell are unlocked and will work here in Canada. Be warned though, without the carrier subsidies that you get when you sign up for a new contract, they're not cheap phones!
Good luck. :-)