When the iPhone sends a text message and types the word "you", it will return to the main interface. Any other word can be used. Why? How to set it up

Did you escape from prison? If you are unlucky after breaking out of prison, you will encounter many small problems, which I have encountered before! If so, you can use itunes to restore the system!

If you haven't escaped from prison, it is estimated that there is a conflict with the system. Just go to Settings-Restore-Restore all settings (if you escape from prison, don't do this, it will be a white apple! )