Have friends in Canada?  Vopium is a company that offers cheap international mobile calling with support for Blackberry and most other smartphone platforms. Vopium has let us know that they have released their new Blackberry app that integrates a free IM service. With the app you can make free calls to Skype, GTalk, and Vopium users, you can chat with Skype, MSN, Yahoo!, GTalk, AIM, and ICQ users, and it also features Twitter support. Starting today, Vopium is offering a special promotion on the count of the Vancouver 2010 Winter Olympics. All calls, either landline or mobile, to Canada will be free through the end of the Olympics. You can also SMS through their app for free to any Canadian mobile number. There are no limits to this offer, call anytime, from anywhere for free, through February 28th.  View the official press release here.