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Register your account at www.telusmobility.com. You'll have a "Plans & Add-ons" tab. and on the left side, your plan will show, you can click on the + sign next to "Included with your plan"
Texting from Canada to US is not included since May 01. It's 40¢/msg and you can add packages (5$/month for 100 text to international or 10$/month for unlimited)