Phone verification options compared

Copying numbers into a dialer and noting which connect. Works for a handful of contacts, falls apart at list scale and tells you nothing about line type or timezone up front.

Live carrier lookups that confirm whether a line is active right now. Accurate and powerful, but priced per query and aimed at high-volume telecom use, often more than an agency cleaning lists needs day to day.

Broad enrichment suites that bundle phone validation with many other features. Great if you need the whole suite; expensive and heavy if you only want to clean a phone list.