If you don't see a mobile channel in edit mode you can double check is display mode "installed".

1. Check do you have class derived from DisplayChannel somewhere in your codebase:

public class MobileChannel : DisplayChannel
{
    public const string Name = "mobile";

    public override string ChannelName
    {
        get
        {
            return Name;
        }
    }

    public override string ResolutionId
    {
        get
        {
            return typeof(IphoneVerticalResolution).FullName;
        }
    }

    public override bool IsActive(HttpContextBase context)
    {
        return context.GetOverriddenBrowser().IsMobileDevice;
    }
}

2. Also if you would like to provide various screen sizes for editors you can do in code as well:

public class IpadHorizontalResolution : DisplayResolutionBase
{
    public IpadHorizontalResolution() : base("/resolutions/ipadhorizontal", 1024, 768)
    {
    }
}

public class IpadVerticalResolution : DisplayResolutionBase
{
    public IpadVerticalResolution() : base("/resolutions/ipadvertical", 768, 1024)
    {
    }
}

Hi, 

Thanks for giving code. But i didn't understood under which hive this file is existing to modify the class .

Just add those classes to the project (if you don't have already) and compile the solution. Location and namespace of the files are not important.

I sugest you download and install the demo templates for episerver and have a look. They have implemented channels in that project. 

For MVC http://world.episerver.com/Download/Items/EPiServer-CMS/EPiServer-7---CMS/EPiServer-7-MVC-Templates/

For WebForms they will be able to install from Deployment Center as a website. You will be able to open both template packages with VS2012 or 2010

Also have a look in this section on world: http://world.episerver.com/Documentation/CMS/