As long as the phone is compatible with the telus network, you can use it with a Telus SIM card.
I'm not 100% clear on all of the concepts, but there are different frequencies within HSPA and GSM.
For starters, they are two different technologies that are not 100% compatible with each other, and have different frequencies/bands.
As long as the unlocked phone you are looking at purchasing uses the correct band(s) that the new Telus network supports, you can purchase a Telus SIM and use it with that phone.
Hope that makes sense. You can always look towards Howard Forms for more detailed info.
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