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This article reports the results of a mobile phone use validation survey in which we compared self-reported mobile phone use to network provider data, and examined the observed discrepancies between both data sources in a convenience sample of 466 Flemish mobile phone users (18–65 years). The results showed significant discrepancies between self-reported and behavioral mobile phone use, particularly for the number and duration of mobile calls. Light users tended to overestimate, while heavy users tended to underestimate their mobile phone use. Females were more likely to underestimate their weekly number of calls. Younger adults were more accurate in reporting their weekly number of calls, but less accurate in reporting their weekly number of text messages. The discussion devotes particular attention to potential question wording effects that are likely to have influenced the results.

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