Everybody has given great info, and I myself use Roam Mobility while in the US (this past weekend for example!). However, nobody has addressed the initial question about texting. Unfortunately, none of the solutions mentioned so far will address that. While you're using your Roam Mobility SIM, you will have a different phone number, based in the states, so any texts you receive on your PM number will just queue up until you return to Canada and swap back to your PM SIM, unfortunately. I suppose if you had another unlocked spare phone around you could put your PM SIM in it before leaving home for your trip and leave it at home, plugged in, and run some sort of app to auto-respond to texts. I'm guessing there probably are such apps for Android and/or iPhone, but the trick is your PM SIM would have to remain in Canada in a phone that's powered on in order to work.
This is one reason why SMS really sucks! Here is another possible workaround: get your contacts to message you on a data-based messenger such as WhatsApp or Facebook Messenger. Although WhatsApp uses your phone number as your user name and how your friends can find you, it will actually still work fine while using your Roam SIM in the US without changing the phone number setting in WhatsApp. I've done that a few times. Facebook messenger similarly has no dependence on your actual active phone number, nor do most data-base messengers, but those are two of the most popular I find. As long as your contacts are okay to message you that way instead of SMS, just top up your Roam SIM with a plan that includes data (either data only or talk+text+data) and you will be fine.
Hopefully that helps a little.
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