If your change your telephone # to a local TN # it will automatically be changed. So to keep your current price plan you'll have to keep your current #. Keep in mind anyone who calls you might get charged long distance if they call you because of where your # is based.
Hi Julien, koodo offer promotional plans for some provinces but in order to qualify for this plans you must live in the province , now, if you move the plan that you have will remain active and you don't have to change it. You can always check updates for plans available in the location where you're moving, you might just get a better deal ;)