The first link...yup, that's right, in answering the question.
The second one...yup, even that user suggested leaving the sim at home.
The third one...yup, yet again the user suggesting leaving the phone at home.
The fourth one...yup, that's right, in answering the question.
Leaving the sim? Why not? It's useless elsewhere other than the states.
I'm not sure of what your intent is here. My sense of your tone is you're challenging me. Ok.
Calls can be forwarded to a Canadian number and then the phone can be turned off. That Canadian number can be from a voip app.
Texts are trickier by needing an app, in a phone, with the sim, on, not in airplane mode, being kept charged, in Canada.
This customer asked about using Public in India. I said no. Just like you. I went on to offer alternatives for his question about calls and texts. You also suggested the calling alternative. But you went into misinformation by saying "do forward calls from your phone to new number. but you have to leave the sim card in device in canada". This is not correct. Once the phone has set forwarding, it can be turned off or taken out of country whatever....except don't let it connect to a US tower as it will break forwarding. You went on to say "but for SMS not forward, just a call" where I interpreted that as saying one can't forward texts. Yes you can. With an app. As outlined above.
Having a quick search in the Play store for "text forwarding" finds lots of results.
