UPDATE 3-T-Mobile adds 2.1 mln net customers, offers free calls to Mexico, Canada
* Unveils service in Mexico, Canada
* Q2 net customer adds 2.1 mln, up from 1.5 mln a year earlier
* Q2 postpaid churn falls to 1.3 pct from 1.5 pct a year earlier (Adds executive quotes, background, updates stock price)
By Anya George Tharakan and Malathi Nayak
July 9 (Reuters) - T-Mobile US Inc said on Thursday that aggressive pricing helped boost its net customer additions in the second quarter by 41 percent over a year ago to 2.1 million, and also offered free calls to and from Mexico and Canada.
The No. 4 U.S. wireless carrier unveiled its "Mobile without Borders" plan, which includes calling, texting and high-speed data services at no extra cost for U.S customers on its "Simple Choice" unlimited service plan traveling in Mexico and Canada.
The plan builds on its previous roaming service that included free international 2G data and texting with call charges of 20 cents per minute.
Shares of T-Mobile, of which Deutsche Telekom owns 66 percent, rose 0.6 percent to $38.72 in afternoon trade.
The move is aimed at helping T-Mobile compete better with AT&T Inc, the second-largest U.S. wireless carrier, which bought Mexico's No.3 and No.4 wireless carriers Iusacell and Nextel Mexico this year. Continuación...