02 investigating as users say data services not working

02 is investigating with "high priority" after users have been complaining that data services are not working.
The network said: "Our technical teams are investigating reports of issues when using data.
"Voice calls are working OK. Our technical teams are investigating. We apologise for any inconvenience..."
Customers tweeted that they were unable to use 3G and 4G services.
Stacey Caine posted: ".@02 come on 02 unable to text anyone all my texts are failing, and no data. Currently using my WiFi."
Andrew Davies said: "Where has all the data gone.....@02 appears to have broken this morning! No mobile access on my phone Good job I have different provider on iPad!"
@anthony_vol1 posted: "Nice start to today 02 data has gone down, thank God for free Wifi on buses."
"Me, my mum and my sister don't have any mobile data either, we have 30gb showing on our 02 account!! Definitely think they have gone down," tweeted @stephanie_bint.
An 02 tweet said: "We are aware our customers are unable to use data this morning. Our technical teams are working on the issue with high priority.