How to bulk-check Number Checker numbers — active_check on Cheker.pro

Bulk-check active_check shows who to reach on messenger vs SMS.

Number Active Checker (active_check) is Cheker.pro bulk Number Checker verification. This guide covers mass phone checks, active_check API, phone intelligence, list hygiene before SMS/messengers, and CSV export for CRM.

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Who it is for

Number Active Checker is used by SMS hubs, performance marketing, crypto compliance, call centers and SaaS with Reseller API. If your pipeline segments «has Number Checker / not» — this task type covers bulk at scale.

What Number Active Checker does

Detect phone number activity level via big-data analytics to improve SMS delivery and reduce costs. Each input line becomes one CSV row with result fields.

Task type: active_check. Family: Number Checker. Input type: phone.

Pricing and output on Number Active Checker landing. Run tasks in dashboard.

Input file format

Upload TXT or CSV: phone numbers in international format (E.164 recommended, e.g. +14155552671). One file = one country only (country code in every line: Brazil 55, US 1, Russia 7).

• Minimum: 2,000 lines per task
• Maximum: 10,000,000 lines (large files auto-split)
• E.164 recommended: +country code, no spaces or brackets
• See format preview in the upload form at Number Active Checker

Do not mix phone, email and username in one file. From Excel export a single column to CSV — avoid formulas and scientific notation.

Output fields

• Number
• activity level

Interpret Number · activity level with a clear rule: «yes» → Number Checker channel candidate; «no» → SMS/email fallback or exclude from campaign.

Use cases

• phonecheck before expensive ws/tg tasks.
• SMS hub saves 28% traffic with active_check.
• phonecheck before expensive ws/tg tasks.

How to run a check

1. Sign up at Cheker.pro and top up USDT
2. Open Number Active Checker — TXT/CSV upload form
3. Wait for completion in «Мои задачи»
4. Download CSV into CRM / SMS hub / BI
5. Automation: Reseller API — active_check

Common mistakes

• Local format without country code → false «no» results.
• Mixed countries in one file → API rejection or wrong output.
• Confusing Number Checker registration with «number is reachable» — different signals.
• Treating «no» as permanent block without re-check after 7–14 days.
• Bulk-check without legal basis (GDPR / local telecom rules) — validation does not replace consent.

Activity vs messenger

Number Active Checker answers whether the SIM is alive, not whether Telegram exists. Ideal before SMS sends.

Related Number Checker checkers

• Phone Number Validation (phonecheck) — Validate numbering format, line type, and reachability signals before running platform-specific checks
• High-value Users Checker (high_value_users) — Identify high-value phone users via big-data signals for better targeting and prioritization

FAQ

How is Number Active Checker different from other Number Checker checkers?

Task type active_check: Detect phone number activity level via big-data analytics to improve SMS delivery and reduce costs. Output: Number · activity level. Compare family variants in the checker catalog and active_check landing.

Minimum batch size and file format for active_check?

Minimum 2,000 lines. phone numbers in international format (E.164 recommended, e.g. +14155552671). One country per file. Format hints on the upload page.

How much does Number Active Checker cost?

Pay-as-you-go USDT: per-line billing at checker rate. Current price per 10k lines on the active_check card and dashboard after top-up.

API for Number Active Checker?

Yes. Reseller API: POST /api/v1/check with task type active_check. Keys: API keys, docs: /docs.

Is bulk checking legal?

Use only lists with opt-in or other lawful basis (GDPR, local rules). Cheker.pro acts as processor on your instructions; you define retention and consent policy.

Summary: Number Active Checker is the bulk layer for Number Checker. Catalog: active_check · run → · Cheker.pro blog