Siemens 3507i SMS problem

3508i Long press (OK) or (Yes) to switch the corresponding different input methods.

If you need to input punctuation marks in Chinese input state, you must switch to English state before you can input them.

One trick: you can store a number in the address book, for example, the name is A and the content is ",",so you can enter a comma ","by directly calling the address book without switching the input method.