
numlookupapi.com
6.7#3 in phone number validation softwareFrom $9.99 a monthFree planWebAPI
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It suits people or teams that need line type, carrier, and reachability information for phone numbers. The free plan may fit lighter use within the 5,000-lookups-per-month limit.
It suits businesses validating numbers for messaging, onboarding, routing, and bulk list processing. Developers needing asynchronous jobs, carrier data, or line-type information can use its API modes.