Hi @asokfair and @koerant,
I checked the UART1 and UART0 on Android.
The UART1 is /dev/ttyHSL0 and it is used for serial console and can not use it for connecting devices such as sensors. This is the kernel option passed to the kernel.
The UART0 is /dev/ttyHS0 and it should be usable on pin5 and pin7 on LS connector.
Thank you for your comment, @koerant.