iTalkBB Prime App lets travellers use Canadian and Hong Kong phone numbers over Wi-Fi or mobile data. It is a calling app, rather than a travel data SIM or eSIM: the app uses an internet connection for calls and messages.
Original promotional material from February 2025

300 monthly international minutes to China/Hong Kong/Taiwan
Free number porting/new numbers
About iTalkBB
World's #1 telecom provider for Chinese & Korean communities
Established in 2003, specializing in overseas Chinese services
More than 1.2 million cumulative users, with services in the United States, Canada, Australia, South Korea and China.
24/7 customer service in Mandarin/Cantonese/English with Vancouver/Toronto retail locations
24/7 Chinese Customer Service: 1-877-482-5503
WeChat Customer Service Online

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Related guide: Preparing a travel data SIM before departure