Calls from O2 numbers
Look through the O2 mobile numbers people have checked, and see what they said about each one.
O2 in brief
Missed a call from someone on O2? Here is a little background on the network. O2 is one of the networks that runs its own masts. People have looked up 3759 O2 numbers on Who Called Me Check so far. As on every network, some of its numbers are used for nuisance and scam calls, such as one-ring call-back tricks and fake bank, delivery or HMRC calls. Spam filters stop some of them, not all, so look up a number you don't know before sharing anything personal or paying for anything.
The O2 numbers people have looked up on Who Called Me Check are listed below. Click one to see its caller rating and what people said after it rang them.
O2 numbers people have checked
These are only numbers that someone has looked up or reported here. It isn't a list of O2's customers.
What a O2 number can tell you
Every UK mobile number has 11 digits and starts 07. The digits that follow were originally issued in blocks to individual networks, so they hint at where the number started life. But because anyone can keep their number when they switch, a number that began on O2 may have moved on, and one from another network may now be with O2.
Many smaller brands also run on a bigger network's masts. Either way, knowing the network tells you nothing about the person calling or whether the call is genuine. That's what the reports are for.
07 number blocks issued to O2
Ofcom has allocated 1,612 blocks of mobile numbers to Telefonica UK Limited, starting in 1995. They fall under the prefixes shown below. Each prefix covers a large number of numbers, and because of porting, any of them may now be with a different network.
The small figure after each prefix is how many blocks it contains.
Ranges by company: Telefonica UK Limited · every range holder
How to check an O2 number
- Enter the whole number in the search box, beginning 07 or +44.
- Check the result: the line type, call cost and caller rating.
- Read the reports to find out what the caller said to other people.
- Add your own rating if it called or texted you.
You might also find the bulk number checker, who is calling me and the 07 prefix guide useful.
Unwanted calls from O2 numbers
- Every network carries scam calls. An O2 number is no safer or riskier than one on any other network.
- Numbers can be faked. A call that shows an O2 number might not have come from O2.
- Be wary of single-ring calls and texts that contain links or ask you to call a number.
- Your codes are yours. Don't give PINs, passwords or one-time codes to anyone who calls you.
- Report it: forward the details to 7726 and contact Action Fraud on 0300 123 2040.
See the scam calls going around and how to report a scam number.
More UK networks
Questions about O2 calls
Can I tell from the digits that a number is on O2?
Only roughly. Every 07 block was first given to a single network, but customers keep their numbers when they switch. A number from a O2 block may since have moved away, and numbers from other blocks may have moved to O2.
Who called me from an O2 number?
The network won't tell you that, and it says nothing about whether the caller is genuine. Scam and nuisance calls come from every network, and caller ID can be faked. Look the full number up here and read its reports.
How do I report a nuisance call from an O2 number?
Forward it free to 7726 so the network can look into it, rate it on its page here so others are warned, and report any fraud to Action Fraud.
Does O2 block spam calls?
Most UK networks label or block some suspected spam, but none of them catch it all. Look in O2's app or on its website for the options, and keep checking numbers you don't recognise.
How many O2 numbers does Who Called Me Check have?
We currently hold 3,759 numbers linked to O2, with 0 published reports. You can search any number, whether it's listed here or not.