My iPhone 4S says no service? - 1

I live in Vancouver, BC, and yesterday I came back from the states. I was in Anaheim and then Portland, and while I was in the US my carrier was AT&T. After we crossed the border back into Canada, my mom and sister both got their "Welcome to Canada" messages and their carriers switched back to Telus. My sister has a Samsung Galaxy and my mom has an iPhone 4. Confused as to why I didn't switch to Telus, I restarted my phone a few times. Over the course of the night I tried taking out my SIM card, restoring the Network connections, and simply restarting my phone. Nothing has worked and it still says no service. Would should I do?

Is your iphone from telus in Canada.

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