List hygiene is the practice of keeping a calling list accurate — removing disconnected numbers, re-verifying line types, scrubbing against DNC registries and deduplicating records — so that dialing effort lands on numbers that can actually be reached.
Contact data decays continuously as people change jobs and numbers are reassigned, and a list is at its most accurate the day it is built. Dialing a decayed list wastes rep time on numbers that cannot connect and, worse, trains carrier analytics that your caller ID produces unanswered calls — so poor hygiene damages your reputation as well as your hour.
The compounding effect is what makes it worth systematising: bad data lowers connect rate, low connect rate lowers caller ID reputation, and a damaged reputation lowers answer rate on the good numbers too.
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Seven days, 1,000 credits, no credit card. Or thirty minutes with the two people who would do the work.