My project centres on checking that a list of locally-formatted mobile numbers is genuine, reachable, and correctly structured before I import them into our CRM. The task is limited to phone number validation only; no messaging or two-factor workflow is required. Here is what I need delivered: • A repeatable method (script, micro-service, or lightweight API wrapper) that takes a CSV of local mobile numbers and returns a clean dataset indicating valid, invalid, and unknown entries. • Validation must go beyond simple regex. Carrier lookup, line-type detection, or HLR dip via services such as Twilio Lookup, Numverify, or a comparable solution is expected so I can trust the “active” flag. • Clear instructions on configuring any third-party keys and running the validation on my end (Mac or Linux environment). • A short report or summary log that highlights overall pass/fail counts and any edge-case numbers your logic could not resolve. Acceptance is straightforward: when your solution flags obvious test cases accurately and processes a sample list of 5,000 local numbers in under five minutes, the job is done. Feel free to choose the language or toolset you are most comfortable with, as long as setup remains simple and dependencies are minimal.