Trying to create valid_if expression to catch...

[Karl_Alexander]

Trying to create valid_if expression to catch users who have location services turned off. 1st attempt: =[_THIS] <> “0.000000, 0.000000”

This worked great at first but then some phones began slipping past with entries like “0.001588, 0.000002” “-0.000397, 0.000060”

Is there an expression others are using to invalidate these geolocation entries that are results of location services being turned off?

Thank you!