I dont see how my phone couldn't pick up on the frequencies? Is it just not designed to? Cause isnt that what a SIM card is for to register the phone on a certain network?
Thanks for answering my questions btw!
The SIM card is only a chip that shows the phone is authorized on a network. It doesn't control frequencies or any hardware at all. The physical hardware / chipsets in phones are designed for very specific frequencies. North America, thanks to the influence of the Americans has chosen different frequency bands than what is common elsewhere. Canada shares most of those frequencies.
The Pocophone is designed for the Asian and Indian market primarily which uses specific common frequencies. Most of those frequencies are also shared with Europe. If you want an imported phone that's most likely to work in North America, look for the Global versions but even that does NOT guarantee it'll work in all areas, especially North America. You'll still need to make sure it still supports the frequencies that your cell provider does. Even if they appear to match there's no absolute guarantee it'll work properly if at all.
One other thing to be aware of is that many Chinese phones do not have Google Play Services installed, that includes the Google Play Store. Netflix has been reported to not work properly on many imported phones (can't display HD), and a lot of local Canadian apps like TV apps (the various Go apps like CTV Go, etc.), may not work at all.
Some Xiaomi devices also come in a global ROM flavour, which supports a lot more bands for connectivity. If you decide to buy one, look for hte global variant. If you buy a Chinese one, you can unlock the bootloader and flash the global ROM to it, as Xiaomi does post them. A lot of Mi Mix 3 owners purchased the one that came with the Chinese ROM and then flashed to the global ROM, which was offered up a couple of months before the global version of the device went on sale.