Touch Number to Call Confusion on Mobile Variant.

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On some of my 'websites with variants' (built with Designer Pro 11) in the mobile version, touching the phone number triggers the device to call the number... on others, it does nothing. I'm trying to see what I've done differently on the ones that function correctly but can't seem to see any difference.

www.meatcosales.com

Is there a a tutorial anywhere that explains this? Or a quick 'How-to' would be great . I would have thought that the mobile variant would do this automatically but that doesn't seem to be the case.

I could sure use some help with this one.

Thank you to anyone who can offer insight.