Toronto start-up zerofone  has passed the 20,000 download mark for its mobile phone app available from Apple’s App Store . To celebrate this milestone, zerofone is tripling its no-obligation free trial  to 30 minutes of free calling for new customers. The free trial allows mobile calls to Canada, the U.S. and many international destinations.
After trying out the service, a new summer promotion will give zerofone customers who purchase a monthly North American calling package an entire month of free calling. Customers simply purchase the first month of calling any time during July 2011, and their second month of calling will be free. 
“It’s been an incredible few months since our official launch in January,” says company President, Ben Rovet. “We’re seeing customers from all over the world take advantage of our service.”
zerofone gives users simple and low-cost access to long distance and roaming (tip: when traveling out of country, use WiFi to avoid roaming charges ) calling from their iPhone, iPad and iPod touch using a combination of Voice over Internet Protocol (VoIP) technology and traditional telecom networks for superior voice quality and reliability.
With zerofone, users can pay less than 1 cent per minute for North American long distance calls and under 2 cents for overseas calls to destinations such as India, China and most of Europe, without using any minutes from their cell phone provider. Canadian wireless carriers normally charge 40 cents per minute for North American long distance calls and 75 cents per minute or more for international calls.
“With roaming, it can work out to $1.50 per minute or more,” says Rovet. “Our service saves some people thousands of dollars per year. It’s really quite astounding.”
When asked what motivated him to start this company, Mr. Rovet said, “Canadian wireless consumers pay among the highest prices in the world for mobile service. We believe Canadians are entitled to more choices and we are leading the way with price, quality and service.”
Once the free trial period is over, users subscribe to one of zerofone’s low-cost calling packages , contract-free. Unlimited calling packages start at $6.99/month. Travel Packs, online phone numbers  and other innovative features  are also available.