No Canadian provider will allow you to maintain a US number (it is a different country, after all). You may be able to port it to a VoIP provider and use it on your phone through an app.
Does my AT&T plan cover Canada?
New and existing customers with an AT&T Unlimited Plan can say goodbye to roaming charges in both Mexico and Canada. Talk, text and use data in and between the United States, Mexico and Canada for no roaming charge.
Which phone carrier is best for international?
Provider Best for Our plan pick
----------- --------- -------------------
T-Mobile Traveling Magenta
Mint Mobile Budget 3-Month Plan
AT&T Day Pass Unlimited Starter
Google Fi Prepaid Flexible + 3GB data
What is the cheapest way to use your phone overseas?
The best option. But the least expensive and easiest way that I've found to use your phone abroad is to buy a local SIM card, which gives you a local phone number in whatever country you're visiting. A SIM card is the little card that goes inside your phone and allows it to connect to a network.Aug 1, 2015
Do cell phones work internationally?
International travel plans allow you to utilize your phone's apps, texting, maps, and other online features without having to pay for roaming rates. An international plan is a service that lets you use your phone in other countries. For instance, while most Verizon phones are global devices, some are not.