Why do I sometimes send messages to others, and the other party receives some illegal characters instead of the original text?

Did you send it in the traditional way?

If the mobile phone receiving your message doesn't support traditional Chinese characters, the mobile phone will be garbled because it can't be decoded. Many domestic mobile phones do not support traditional Chinese characters, which is the most prone to garbled codes.

If the mobile phone receiving your message supports traditional Chinese characters, there will be no garbled code. Foreign brands of mobile phones generally support traditional Chinese characters, and this kind of garbled code phenomenon will not appear under normal circumstances.