How much does minutes and texts cost while in the US using my Petro-Canada phone?

I have a prepaid plan with Petro Canada Mobility.  I'm going to the US and would like to know how much each minute of talking is likely to cost, and how much each text - both within the US.  Thanks

Talk and text in the US will be $0 because the Petro Canada SIM does not work outside of Canada.  However if you are near WiFi, I do calling and texting on free apps like TextPlus.

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