Iphone 15 bought in china use in Canada

It should work fine. But you WON'T be able to use eSim on an iPhone purchased in China, as iPhones made for the China, Hong Kong and Macau markets are dual Physical Sim only. And you won't have warranty on the phone in Canada. If you need to have the phone replaced or serviced, you'll have to go back to China.

All iPhone models are world phones, so you can use them almost anywhere. Whether you are a GSM or CDMA network customer, you can roam internationally on GSM networks in over 200 countries or regions around the world. Availabilitys of LTE data varies in some countries or regions and depends on carrier support for certain LTE radio frequencies. Contact your wireless carrier for more information regarding international roaming policies and rates.

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If you do not buy Apple Care+ then...

IMPORTANT RESTRICTION FOR iPHONE, iPAD, APPLE TV AND HOMEPOD SERVICE.

Apple may restrict warranty service for iPhone, iPad, Apple TV and HomePod to the country where Apple or its Authorized Distributors originally sold the device.

Service & Support. Apple Authorised Service Providers and Online Support. Explore Service Locations. 

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