
APIFreaks Phone Validation API
5.9#12 in phone number validation softwareFrom $500 a yearWebAPI
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It suits developers adding signup phone checks, trust-and-safety engineers, and teams cleaning contact lists before SMS campaigns. It is not a way to confirm that a handset is on or a subscription is active.
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.