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Guides

Guides, written for people who dial.

Long-form guides to phone data and calling lists, from the basics to the details developers need.

GuidesHow to validate phone numbers.Three levels of phone validation, from checking the format to checking the line to deciding whether a number is worth a call, with code for each.

Know who’ll answer
before you call.

Grade 250 contacts free. No card required, and US phone numbers only.

  • US phone numbers only
  • No card required
  • One credit per checked contact
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