O2 customers across much of the UK have reported problems with their mobile phone internet as many experience outages.

Users in areas Like London, Manchester, Glasgow and more have reported mobile phone issues and "No Signal".

Issues were first flagged by Downdetector UK at around 1 pm in a tweet reading: "User reports indicate O2 is having problems since 3:05 PM BST. http://downdetector.co.uk/status/o2/ RT if you're also having problems #O2down."

A Virgin Mobile O2 spokesperson said: "We’re aware of the issue that is impacting Sky Mobile customers.

"Whilst they use the O2 network, this issue is impacting Sky Mobile services only and our network is working as usual."

The issues appear to be affecting GiffGaff and EE customers with similar spike reports also seen for on Down Detector.

Why is O2 mobile internet down as users report 'no signal'?

Users reported a number of issues with the O2 service with 59% having problems with mobile phones, 27% reporting to have "No Signal" and 14% complaining about mobile internet.

One user responded to a Sky customer complaining about a service outage, saying: "There must have been a reason you left your previous provider? The fact is they’re all the same, occasionally we will have outage. O2 is out as well."

Another user responded to O2, saying: "Cannot not make a call or text to an @O2 phone (or from an #O2 phone) Apparently there is an outage across the UK. Care to update your customers? Thanks."

O2 replied: "Hello, we're not aware of this. Drop us a DM with your postcode, we'll take a closer look."