AT&T sim card on Motorola Raz | Other carriers | Consumer forum

I just bought a phone on Ebay and activated it in the US with AT&T prepaid $100 sim card . Can I now go to a Rogers outlet and activate the same phone by using their sim card and using it here in Canada.
This will allow me to just change the sim card depending on where I am. I hardly ever use my phone but this will give me a year of service (AT&T prepaid expires in 365 days.) when I am in the US. Would like to set up the same in Canada.