A bit of context for our American friends:
The distinction between local calling and long-distance calling is alive and well in Canada. Nationwide, carrier-agnostic incoming and outgoing calling at the anytime rate is definitely the exception rather than the rule.
If you use your Rogers cellular phone to call any phone number whose registered address is outside the local calling area of the cell tower you're currently using, you will be charged an extra per-minute long distance fee in addition to your regular airtime. For example, if your account is registered in Toronto, and you visit Vancouver, then you can place calls to other Vancouver numbers at your normal airtime rate, but calls home to Toronto will cost extra.
Similarly, if you are connected to a cell tower that's outside the local calling area of your account's own registered address, then all incoming calls, no matter where they are originating, will cost you an extra long distance fee in addition to your regular airtime. For example, if your account is registered in Toronto, and you visit Vancouver, then every call you receive will cost you more than if you were receiving the same call while you're in Toronto.
If your sister also has a Toronto-based cell phone, and she travels with you to Vancouver, and she calls your cell phone, then you'll both be charged long distance: Her for dialing out to a non-Vancouver number, and you for not being Toronto when you received the call.
Changing the layout of your local calling area can have a direct, tangible effect on what your calling plan will cost you.