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As The Wall Street Journal points out,
Why is this a big deal?
China Mobile is the world's largest carrier, but perhaps more importantly, it's in China, where Apple is getting walloped by Android devices in terms of market share. In fact, according to Gartner, four out of every five smartphones sold in China run on Android.
Emerging markets like China, India, Indonesia, etc. are very important to smartphone makers looking to grow. People in those countries are just starting to make the transition from regular cell phones to smartphones. Part of the reason for that is smartphones are now much more affordable, especially Android phones.
If Apple wants to grow its iPhone business, China Mobile is a great carrier to partner with.