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Working notes on phone data quality, country coverage and why freshness beats volume.
Data basics
What a phone number database actually contains
A catalog is a set of columns and measurement contracts, not a pile of digits. What each field means before you license one.
Read article →Buying guideReading country coverage without getting fooled
Country totals are the easiest number to inflate. How to compare two vendors on equal terms before you talk about price.
Read article →Data basicsWhy freshness beats volume in phone data
Stale records are not merely less useful, they are actively expensive. How to price freshness into a buying decision.
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