Unlocked AT&T S3, Will it work in Canada on Telus?

I'm looking to buy an S3 here in the US, it's however on AT&T
My question is, will I be able to use it on Telus (my current network in Canada)
If I get it unlocked?

Note: Not sure if this helps but my phone automatically switches to AT&T when I cross the border

Need urgent help!!

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You would have to enable the CDMA antenna on the S3. It can theoretically be done, but would require some custom programming. It would probably be more trouble than it's worth.