LordLiverpool on "Mobile version of website"

Hello WordPress

A friend of mine has built a website using WordPress and the Invictus Theme (from ThemeForest)

http://midi-photography.net/

When he views his website on a smartphone he gets redirected to

http://mobile.midi-photography.net/

How does this happen???

Is it WordPress that automatically redirects the viewer to a mobile subdomain?

For my friend the real problem is an ugly looking banner has been unexpectedly inserted at the top of his website labelled "Coming Soon.." Does anyone know where this comes from?

See screen shot here:

http://i1091.photobucket.com/albums/i395/LordLiverpool/ScreenShot3_zps4a914924.jpg

Its same result on an adroid phone, an iphone, and in the Top 5 browsers (Chrome, IE, Safari, FireFox and Opera)

I contacted the Theme author and he said it was nothing to do with his theme.

There are no plugins installed.

There have been no modification made to any of the code.

Can anyone explain to me where the subdomain mobile. come from and how I can go about editing it to remove the banner.

Thanks in advance.