UART is abbrevation for Universal Asynchronous Receiver/Transmitter.Dual sim phone usually need to set up UART. You can choose Sim1 or Sim2.when the phone is dual sim cards,dual standby: if you choose Sim1, then Sim1 may have more functions than Sim 2. For example, some phones do not support dual blueteeth, and at that time only one card can own this function.
The user interface is software.
Graphical User Interface
This is what the user sees and works with when using the computer..Different types are Graphical user interface, Command line interface and Manual driven interface
when the window is user friendly then we can easily use the user interface.
Graphic User Interface (user-friendly)
Magic User Interface was created in 1993.
Graphical User Interface
When an interface is easy to use it is normally referred to as a user friendly interface. A friendly user interface saves time and does not require any special skills to operate.
Graphical user interface
Aqua - user interface - was created in 2000-01.
Graphical User Interface.