NoCall

Transparency

At NoCall we believe trust is built with transparency. Here we explain how our system works, how we calculate risk score, where our data comes from, and how we protect your privacy.

How our reporting system works

NoCall is a community platform: users identify and report spam numbers. The process works like this:

  1. The user reports a number — From the app or the website, anyone can report a suspicious number with a category (telemarketing, scam, debt collection, surveys, harassment, etc.). No account is required.
  2. Reports are moderated — Our team reviews reports to keep the database high quality. False or malicious reports are discarded.
  3. Approved numbers enter the spam database — Once verified, numbers join the block list that syncs automatically with the NoCall app on all devices.

This moderated community model keeps the database reliable and up to date with the latest threats.

Risk score

Every number in our database has a risk score from 0 to 100. It is calculated automatically with the following formula:

risk = min(100, reports × 5 + (verified ? 30 : 0))

Each report adds 5 points. If our team has verified the number, 30 additional points are added.

Risk levels are classified as follows:

Low0–39

Few or no reports. The number shows no clear spam signals.

Medium40–59

Several reports received. Exercise caution before answering.

High60–79

Many confirmed reports. High likelihood of spam or aggressive telemarketing.

Critical80–100

Number verified as spam or scam. Blocking immediately is recommended.

Operator data

For each number you look up, NoCall automatically identifies the telecom operator and line type (mobile, landline, special rate, etc.). This information comes from public data of the CNMC (Spanish Markets and Competition Commission), the regulator for telecommunications in South Africa.

CNMC data includes numbering block assignments for each operator, which lets us determine precisely which company owns a number and whether it is mobile, landline, or special rate.

Privacy and data

Privacy is a top priority at NoCall. Our commitments:

  • No personal data — We do not collect users’ names, emails, or phone numbers.
  • Anonymous reports — Reports are processed anonymously. We only use IP addresses to limit abuse (at most 1 report per number every 24 hours per device).
  • No tracking cookies — We do not use tracking cookies or ad tracking tools.
  • GDPR compliance — NoCall complies with the EU General Data Protection Regulation.
  • On-device processing — In the app, call and SMS filtering runs on your device without sending that data to external servers.

Open database

NoCall’s database is built by the community and helps protect everyone. Each report improves detection of spam and phone scams in South Africa.

1 492
Spam numbers detected
0
Community reports
0
Reports today

Anyone can look up a number on our website to see if it has been reported, read other users’ comments, and check its risk level. The information is public and available without registration.

Code of conduct

To keep our database accurate and trustworthy, we apply these rules:

  • False reports are not allowed — Deliberately reporting a legitimate number as spam violates our rules.
  • Active moderation — All reports go through review before joining the block database.
  • Right to correction — If a number was reported by mistake, the owner can request review and removal via our contact page.
  • Continuous improvement — We use community feedback to improve detection algorithms and moderation processes.
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