An Unknown Number Keeps Calling: What to Do

An unknown number calling once is mildly annoying. The same one calling three times before lunch - or at 11pm - is unsettling. The instinct is either to answer and demand who it is, or to block and ignore. Often neither is quite right. This guide gives you a calm, sensible way to handle an unknown caller, identify them if you can, and shut down the nuisance if you can't.

First, don't panic - and don't feel rude

The single most useful habit is this: you do not have to pick up. Screening calls is normal and sensible. If someone genuinely needs you, they'll leave a voicemail, send a text, or try again and identify themselves. Treating "I didn't recognise the number so I let it ring" as perfectly acceptable takes all the pressure off.

If you do answer and the caller won't say who they are or which company they're from, you're entitled to hang up. A legitimate caller will always tell you their name and organisation when asked.

Work out who's calling

Before you block anything, spend 30 seconds identifying the number:

1. Note the number type. Paste it into our free phone number checker to see whether it's a UK landline, mobile, freephone, service or premium-rate line - and for landlines, the area it's registered to.
2. Check for a voicemail or text. Genuine callers leave context: an appointment reminder, a delivery slot, a callback request.
3. Search the number online in quotes - repeat nuisance numbers are often already reported by others.
4. Match it to something you're expecting. A job application, a tradesperson, a parcel, a clinic.

Our full walkthrough on how to find out who called you covers each of these in more detail.

Why the same number calls again and again

Repeated calls from one unknown number usually fall into a few categories:

• Automated marketing diallers. These systems ring many numbers at once and only connect an agent when you answer - which is why you sometimes get silence or a delay before anyone speaks.
• Scam campaigns. Fraudsters dial the same numbers repeatedly hoping to catch you at a weak moment, often using a spoofed caller ID so the number looks different or local each time.
• A genuine caller having trouble reaching you - a delivery driver who can't find your address, for instance. This is exactly why letting one call go to voicemail first is so useful.
• A misdialled or recycled number. Sometimes people are simply trying to reach the number's previous owner.

A simple decision: identify, then act

Once you've identified the number, the action is straightforward:

• Likely nuisance or scam? Block it and, if it's clearly a scam, report it. You can also forward scam calls and texts to 7726 so your network can investigate.
• Possibly genuine but unverified? Don't hand over any personal or financial details on the call. If they claim to be your bank, a delivery firm or a government body, hang up and call that organisation back on a number you find independently. For banks, you can dial 159 to be connected safely.
• Confirmed genuine? Save the contact so it doesn't catch you out next time.

When the calls feel threatening

If an unknown caller is abusive, threatening, or won't stop despite being blocked, this moves beyond ordinary nuisance. Keep a simple log of dates and times, don't engage, and report it. Threatening or malicious calls can be reported to the police on 101 (or 999 if you feel in immediate danger), and your phone provider can advise on call-tracing and additional blocking. Persistent silent calls can also be reported to the regulator.

The bottom line

An unknown number calling - even repeatedly - is rarely the emergency it can feel like. Screen the call, identify the number with a free check, and look for context before doing anything. If it's a nuisance, block and report; if it might be genuine, verify independently rather than trusting the caller. Calm and methodical beats anxious and reactive every time.