The data was collected with these methods > MobiLens data is derived from an intelligent online survey of a nationally representative sample of mobile subscrib

The data was collected with these methods > MobiLens data is derived from an intelligent online survey of a nationally representative sample of mobile subscribers age 13 and older. Data on mobile phone usage refers to a respondent’s primary mobile phone and does not include data related to a respondent’s secondary device. I don't think that the 0.4% figure is statistically significant considering the much larger margin of error likely to be in the results.