How to Do LINE Number Screening: List Cleanup, Activation Check, Result Interpretation, and CRM Write-Back

A step-by-step guide to checking which numbers in a customer list have activated LINE: unify to E.164 format and split by country, first exclude invalid and high-risk numbers, then perform LINE activation checks; also explains the difference between "activated" and "searchable," misjudgments caused by number changes, and how to choose between web console and API and write results back to CRM.