I am not able to access the site property as I have defined named "serverUrl".

I will change this value in service center but I am not aware to access this value at mobile page or in expression. ?

can anyone help me?

Hello Manish,

Site Properties are "server" elements.
You can't reach them from an expression in the Screen.

If you need its value, you have to create a mobile Server Action to return its value and use this Server Action inside a (Client) screen action that finally can set it to a local variable used in the screen... I know... :(