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020 4583 9034 Negative Who called me from this phone number?

London • Colt Technology Services
This number is a landline operated by Colt Technology Services and located in London, England. The overall user rating for this number is Negative. The number 02045839034 has been searched 140 times, with 2 user comments helping to identify the caller's intent.
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At a glance

Community signals

  • User reports: 2 user reports
  • Searches: 140
  • Last reported: 5 months ago
  • First reported: 6 months ago
  • Typical call time: before 3pm (90% of calls)

Number profile

  • UK format: 020 4583 9034
  • International: +442045839034
  • Number type: Landline
  • Carrier: Colt Technology Services
  • Area: London
  • Area code: 020

User Reports (2)

Your reports help others decide whether to answer calls from this number. Share your experience to help the community!

Unknown Caller
11 Dec 2025

I’ve had this also. They call from various different numbers and they get very argumentative. Relentless at trying to get a conversation but also very difficult to block them when they use several numbers from different area codes but it’s the same woman!! Often there’s a crying baby in the background and she then “transfers me to her supervisor” which is an erratic male. Screams scam and has been escalated to sky

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Scam/Fraud
02 Dec 2025

Said they were from Sky mobile wanting to send me a new sim card. They said other sky users were having problems with this type of sim card. The woman was very difficult to understand (VERY heavy Indian accent). As soon as I said I was the main holder of the Sky contract, she wanted to transfer me across to her supervisor. Whole thing stinks of scam. I'm now getting bombarded with texts from this number as I have blocked the calls.

Caller: Sara Tock
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What type of call was it?

Reported locations

Reported from 21 UK cities

Mattishall, London, Wrexham, Doncaster, Pembroke Dock, Portishead, Exhall, Castle Vale, Cambuslang, Burnham-on-Crouch, Camberwell, Wigan, Middlesbrough, Staveley, London (Shadwell), Birmingham, Sheffield, Upton Lea, London (Shoreditch), Bristol, Marden

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How to Block This Number

On iPhone

  1. Open the Phone app and go to Recents
  2. Find the number 020 4583 9034 and tap the info icon (i)
  3. Scroll down and tap Block this Caller
  4. Confirm by tapping Block Contact

On Android

  1. Open the Phone app and tap the 3-dot menu
  2. Go to Call history or Recents
  3. Long press on 020 4583 9034
  4. Select Block number or Block/report spam

On Landline Phones

Several options are available for UK landlines:

  • BT Call Protect - free for BT customers
  • TalkTalk CallSafe - free for TalkTalk customers
  • Call blocking devices like CPR Call Blocker (available on Amazon)

Register with TPS (Telephone Preference Service)

The TPS is a free service for UK consumers that allows you to opt out of unsolicited sales and marketing calls.

Learn more about TPS registration

Latest reports

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Call Costs

Calling 02045839034 from a landline may cost up to 16p per minute. Many providers charge a 23p call set-up fee. Call packages often include these types of calls. You might not incur additional charges for calling this number, depending on your provider.

Dialling Instructions

Local UK callers can dial 02045839034 directly.

International callers should dial +44 20 4583 9034 or 0044 20 4583 9034. No leading zero is required when dialling abroad, e.g., +44(0)2045839034.