How to Run Telegram Bulk Number Checks: List Cleaning, Detection Options, Result Interpretation, and CRM Write-Back

Before running Telegram detection on a multi-country contact list, normalize numbers to E.164 and deduplicate, then split by country, choose detection options, submit via console or API, and write results back to CRM grouped by valid and invalid. The article explains each step, why "unmatched" does not mean "unregistered," and why building your own bulk lookup scripts with personal accounts is not advisable.