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How to enter Pinyin when sending SMS on Nokia 3230?

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Press the "#" key to switch the input method, or press the pen key (that is, the button with the pen icon on the right side of the hang-up key) to select the pinyin input method.

After reading your supplementary question, I don't know if the content I want to type is pinyin. If so, I can only write letter by letter.

The problem is not very clear.