Hi Greg,

the mobile detection is done in the System Template Switcher plugin, but unless there are some other plugins or extension doing weird detection it works on every mobile device.

What you can try to do is the following:

1. Ensure that the template switching is enabled
2. Ensure that the 'Include tablets' option is enabled
3. Order correctly the plugins as reported in the PDF docs
4. Clear all cookies on devices used to test it
5. Investigate if there are any other extensions installed doing the same thing

Best regards
John