An unknown number is calling me: what to do step by step

An unknown number is calling me: what to do step by step

Getting calls from numbers you have not saved is increasingly common. Before answering or calling back, it pays to check who is behind them: the NoCall community keeps a database of user reports on phone numbers.

1. Do not answer with your details

If you decide to pick up, listen first. Do not say your full name, do not confirm your NRIC number and do not share codes that arrive by SMS. A genuine caller will identify themselves without asking for sensitive details upfront.

2. Look the number up on NoCall

The NoCall database holds a large catalogue of numbers identified by the community. For each number you can see its risk score, its category and comments from other users:

• Risk score — from 0 (safe) to 100 (dangerous).
• Category — spam, telemarketing, scam, debt collection, surveys.
• Comments — what other users who got the same call reported.

3. Read the first digits

Most Singapore numbers have 8 digits, and the first digits give you immediate clues about the kind of call:

• 8 or 9 — Singapore mobile (handphone) number.
• 6 — Singapore landline.
• 3 — internet-based (VoIP) number.
• 1800 — toll-free number.
• + and a foreign country code — international call: check the country before calling back, as it may be expensive.

4. Decide: call back, block or ignore

• Low risk and a plausible reason — call back as normal.
• Spam or pushy telemarketing — block the number and report it on NoCall.
• Possible scam — do not call back; if you have already shared details, contact your bank and make a police report.

5. Protect yourself going forward

Turn on your phone's spam filter and the NoCall app to identify incoming calls automatically. Registering on the Do Not Call (DNC) Registry cuts down marketing calls from legitimate organisations, and the ScamShield app lets you check and report suspicious calls. If the call felt suspicious, also read our guides on suspicious calls.

Should I answer a call from an unknown number?

You can answer, but never share personal or banking details. If the call matters, they will leave a message or call back. Afterwards, look the number up on NoCall to see whether other users have reported it.

How can I find out who called me from an unknown number?

Look the number up on NoCall: you will see its risk score, its category (spam, telemarketing, scam), the telco and comments from other users who got the same call.

Is it dangerous to call back an unknown number?

It can be: some premium-rate numbers charge high fees when you call them. Always check the number on NoCall before calling back.