Both the USA Canada and Mexico Extreme Plan and the USA Canada and Mexico Max Plan work in Canada and Mexico. This means you can use your data, and you can call an text to USA Canada and Mexico numbers.
You must first use your SIM card in the USA to thereafter be able to use it in Canada or Mexico.
If you're travelling directly to Canada or Mexico without transiting through the USA, then our SIM cards will not work for you in Canada or Mexico. There are no exceptions whatsoever.