HN user
We solve a similar problem but our approaches are different. For example, we don't charge for every bit of information and we integrate with social networks to provide a more complete version of the profile, including job position and education.
Exactly! These numbers represent the percentage of API calls that we resolve depending on the numbers' country. That is, we are likely to add information to a phone number if the phone number is from the US, but we also do quite well globally.
Around 50% of the numbers are from the US and most of them are residential. We estimate that around 1% of the numbers are from businesses.
Trello and Evernote work for me