Detecting low memory devices

Question

I'm trying to remove the option to enable live tile in my app for users running a low memory device (like the Nokia Lumia 610). I'm using the code below that I got from Microsoft but a few users running Lumia 800 and Focus i917 report that the live tile functionality disappeared after I added this.

What is the proper way of detected a low memory device?

This is the code I'm using that obviously works in the emulator and for most of the users but not for all:

long result = 0;

try
{
    result = (long)DeviceExtendedProperties.GetValue("ApplicationWorkingSetLimit");
}
catch (ArgumentOutOfRangeException)
{
    //The device has not received the OS update, which means the device is a 512-MB device.
}

if (result < 90000000)
{
    //Low memory device
}

Answer 1

I use this code. The problem is probably in the constant, mine is from MSDN page about low memory devices: Developing for 256-MB Devices

/// <summary>
/// Flag if device is Low-memory Tango device or not.
/// </summary>
public static bool IsLowMemDevice
{
    get
    {
        if (!isLowMemDevice.HasValue)
        {
            try
            {
                // check the working set limit 
                long result = (long) DeviceExtendedProperties.GetValue("ApplicationWorkingSetLimit");
                isLowMemDevice = result < 94371840L;
            }
            catch (ArgumentOutOfRangeException)
            {
                // OS does not support this call => indicates a 512 MB device
                isLowMemDevice = false;
            }
        }
        return isLowMemDevice.Value;
    }
}
private static bool? isLowMemDevice;