To deactivate the flight mode on the TCL Onetouch 4043, follow these steps:

- Go to your phone's menu.
- Select Settings.
- Navigate to Connections or a similar menu item that contains the network settings.
- Find the entry Flight mode and deactivate it.

Alternatively, you can also use the quick access settings if these are configured for flight mode. However, you will normally find the flight mode under the connection or network settings.