Unknown Caller
2 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
2 months
ago
User Reports (5)
Spam
3 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
3 months ago
pretend they are from 02
Unknown Caller
3 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
↑ Back to reportsHow 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 registrationAbout 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