My Telus pay as you go phone does not work in the USA. How do I make it work?

I asked Telus in Courtenay, BC how to have my phone work in USA. I was told just buy a new SIM card and have  it installed. In USA I was told I need a number from Telus to unlock my phone first. HELP my number is 

Hi John. I believe it's post paid service that only has roaming features.

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