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How to set Apple's SMS to nine-key spelling?

In IOS7 and above systems, they all have their own nine-grid keyboards.

Open General →→→→→ Keyboard →→ Keyboard in the settings, and then select Simplified Chinese. The keyboard layout will have nine options.

If it is a system lower than IOS7, you may need to install Baidu or sogou input method to have Jiugongge.