Unknown Caller
4 months ago
The caller claimed to be from Giffgaff overing in updated 5g SIM card and 30% discount on my monthly bill
Community overview
Community rating:
Mixed
5 user reports
First reported 2 Dec 2025
·
Last reported
4 months
ago
About this number
Number formats
- UK format: 020 3727 8536
- International: +44 20 3727 8536
Number details
- Number type: Landline
- Number range allocated to: Gamma Telecom Holdings Limited
- Area: London
- Area code: 020
Reported categories
Based on 5 public user reports
Unknown Caller
60% (3)
Scam/Fraud
20% (1)
Spam
20% (1)
User Reports (5)
Spam
4 months ago
Claiming they are from O2 upgarading all sims and offering 30 % discount Asked for my email I said I need to talk about my insurance claim I got going through they transferred me to someone else and they said there the manager I speak to O2 lots and this isn’t them at all. Scam call
Scam/Fraud
5 months ago
pretend they are from 02
Unknown Caller
5 months ago
Missing call
Unknown Caller
02 Dec 2025
Called me cos i registered for a Free asthma pin bage Want to give me info. Bit i am too busy to take call currently at work.
Reported caller:
Unknown
Report this number: 020 3727 8536
↑ Back to reportsDid this number contact you?
You’ve already submitted a report for this number.
Your report may still be going through moderation before it appears publicly.
Your report
How did they contact you?
How would you describe the contact?
Please do not include full names, private addresses, or abusive, hateful, or defamatory content. Please read our Community Standards before posting.
Thank you. Your report has been received.
Before appearing publicly on the site, reports may be reviewed and checked as part of our moderation process.
How to Block This Number
On iPhone
- Open the Phone app and go to Recents
- Find the number 020 3727 8536 and tap the info icon (i)
- Scroll down and tap Block this Caller
- Confirm by tapping Block Contact
On Android
- Open the Phone app and tap the 3-dot menu
- Go to Call history or Recents
- Long press on 020 3727 8536
- 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