@Ana2
As mentioned your best scenario is to get a free voip phone number (textnow and/or fongo) you could then forward your pm phone number to your fongo number to recieve calls and your voice messages. Text messages cannot be forwarded. Text messages would have to be sent directly to your fongo number or textnow number. Textnow has free texting but fongo charges a small fee to send outgoing texts. After forwarding your pm number the pm sim card must remain in Canada so you would remove it from your phone and put it somewhere for safekeeping.
For Brazil in particular fongo is your preferred voip choice as it works on both wifi and mobile data. Unlike most countries wifi is not readily available so you would be reliant on mobile data if you are travelling. It would also be imperative to download WhatsApp as this is one of the main forms of communication in Brazil and is included in most data plans (so its use does not count against your data amount). Plans are renewed on a weekly basis with free calling and texting and 1GB of 3G/4G for about $2 cdn. Autorenewal usually adds an extra 1GB p/wk for free. If you prefer OneSim is a reasonably priced global sim card that can be ordered ahead of time so you have service as soon as you arrive as local sim cards are not sold at airports in Brazil.
Edit: See post below for corrections on text and call forwarding options.
Read this article for more info....
https://toomanyadapters.com/buying-sim-card-brazil/
