Regarding htc t7373, the mobile phone recently sent a short message. The screen was originally vertical, but it turned into horizontal. How did this happen?

This is the reason for gravity induction. This was originally a function of this machine, but if you want to turn it off, you can press the operation option (gear 1) under the main screen and select < g-sensor > Just turn off Automatic Screen Rotation.

# By the way, I wonder if you changed the theme. "Automatic screen rotation" of the "gravity sensor" in the settings is usually provided in the default "TouchFLO 3d" of the machine ~