Why are the short messages I send to others not normal Chinese characters?

I still don't know much about your situation, so I summarized it.

1 mobile phone poisoning

2 Different mobile phone systems Some old mobile phones do not support long and short letters and multimedia messages.

Some friends report that sometimes receiving a friend's fixed text message is always a bunch of random codes, but it's okay to send him/her a text message or receive someone else's text message.

I have just encountered this problem, but I found that the text messages sent by my friends always appear garbled from the place where punctuation marks should be, but the first few words are fine. I asked him to text me as little as possible without punctuation, and it was normal.

Press [start] >; [Inbox/SMS] > [Menu] > [Options] > [Send Settings] > Under the item, check "Send short messages in Unicode if necessary", and then press [Finish].