I have got the Nexus 5 and it's very cool that you say "OK Google" to trigger voice search function, you can also speak to use Google Now to find interesting things for you. But Google Now is not available in China, and by default you will see in Android system settings it says Google Now is not supported in China. But the great fire wall cannot stop us, and below is the way you can do it.
The prerequisite is that you have a rooted device. 1. Please download -> https://app.box.com/s/tgyl597g1le2ciekxsho (Market Unlocker 3.3.3)
2. After installation, search in cool market an app called "market unlocker". Run it and turn on
1) Enable Unlocker
2) Auto Unlocker
3. Turn off location
Go to Settings, under "PERSONAL" there is "Location" icon, click it and turn it off.
4. Clear Data and Cache of Google apps
Very importantly, please turn off your WiFi in this stepGo to Settings-->Apps, slice to ALL apps, clear cache of three Google apps
1) Google Play services (Click manage space, and then clear all data)
2) Google Play Store (Click clear data)
3) Google Search (Clear data)
Now reboot your device
1. go to Google Play to initialize it.
2. long lick the "Up" icon in home screen and click Google now.
Wait Google Now to be initialized. After this, you can enable locations service and google now will be there with you.
OK, Google!
