T-Mobile is extending its Simple Choice plan to include calling in Canada and Mexico as part of what it's calling "Mobile without Borders." Simple Choice already allows users to text and use data in well over 100 countries, but the addition of calling to the plan means that you'll be able to use your phone as if you were at home from anywhere in the continent. If that sounds a little familiar, that's because AT&T recently announced it plans to create a "North American Service Area" after the purchase of Mexican carrier Nextel goes through. Unfortunately, AT&T's North America forgot about Canada, meaning T-Mobile's roaming deal seemingly tops AT&T's before it's even launched.