I have an At&t Blackberry Bold will it work with a telus SIM card?

Telus/Bell HSPA network operates on the GSM 850/1900

Your Blackberry Bold operates on 2G: GSM 850 / 900 / 1800 / 1900
3G: HSDPA 850 / 1900 / 2100

If your Blackberry is unlocked, it will work. But, you'll have to contact Telus and have them authorize you to use the Blackberry network on their system.
 
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