<p>American messaging services could learn a thing or two from WeChat.</p><p>The mobile-focused app is massively popular in China and spreading quickly abroad; of the 270-million-plus regular users of the service, about a quarter of those are outside of mainland China.</p><p>Aside from its wide user base, WeChat's biggest success looks to be in its bottom line: In-app purchases.</p><p>Take WeChat's recent experiment with the fast-growing Chinese smartphone maker Xiaomi. The two companies teamed up to offer a limited number of Xiaomi's latest flagship phone, the Mi-3, inside the WeChat app exclusively. Xiaomi set aside 150,000 devices to sell for the promotion, and the phones sold out completely all within about 10 minutes.</p><p><a href="http://allthingsd.com/20131129/pay-attention-snapchat-chinas-wechat-messaging-app-does-e-commerce-well/">Keep reading...</a></p><p>Read also:</p><p><a href="http://thenextweb.com/asia/2013/11/28/first-5-games-tencents-wechat-messaging-app-hit-570-million-downloads-just-3-months/">WeChat Games Hit 570M Downloads in 3 Months</a> (The Next Web)</p><p><a href="http://www.androidheadlines.com/2013/11/xiaomi-sells-150000-mi3-smartphones-10-minute-flash-sale-messaging-app.html">Xiaomi sells 150000 Mi3 Smartphones in a 10 minute Flash Sale through a ...</a> (Android Headlines - Android News)</p><p><a href="http://www.geeky-gadgets.com/xiaomi-sold-100000-mi3-smartphones-in-less-than-10-minutes-30-11-2013/">Xiaomi Sold 100000 Mi3 Smartphones in Less than 10 Minutes</a> (Geeky gadgets)</p><p>Explore: <a href="http://news.google.com/news/more?ncl=dXjUcrha5MCJkgMYTERo2hojjGWSM&ned=us">15 additional articles.</a></p>