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020 3574 8042 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, UK. The overall user rating for this number is Negative. The number 02035748042 has been searched 12 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: 12
  • Last reported: about 1 hour ago
  • First reported: 9 months ago
  • Typical call time: before 10am (52% of calls)

Number profile

  • UK format: 020 3574 8042
  • International: +442035748042
  • 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!

Telemarketer
1 hour ago

Say they are O2 lady with strong accents not good for deaf people they are persistent after explaining worrying

Caller: O2
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Unknown Caller
20 Aug 2025

I did not answer, there is no message, why does it start with +44 if a UK number... multiple calls - annoying - blocked

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What type of call was it?

Reported locations

Reported from 9 UK cities

Marsden, Kingston upon Thames, London, Shirley, Kelvedon, Balerno, Old Windsor, Leeds, Horsforth

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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 3574 8042 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 3574 8042
  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)

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Latest reports

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Recommended Guides

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Call Costs

Calling 02035748042 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 02035748042 directly.

International callers should dial +44 20 3574 8042 or 0044 20 3574 8042. No leading zero is required when dialling abroad, e.g., +44(0)2035748042.