Thousands of O2 customers have not been able to get online on Thursday morning following a technical fault with the network.
O2, which is owned by Spain's Telefonica, said customers of Tesco Mobile, Sky Mobile and GiffGaff, which all use its network, were also affected by the outage. It later said in a separate tweet that voice calls were working properly. The company estimated 32.1 million people use its mobile network in the UK.
Customers can still make calls but cannot use applications that rely on a data connection or browse the internet.
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"Anyone can get the flu and face serious complications, which include death", said DHD#10 Medical Director Jennifer Morse. There will be signage posted to direct anyone wanting a free flu shot to the flu clinic entrance and parking.
OUTAGE UPDATE 10.45am: One of O2's third party suppliers has identified a software issue in their system.
The network confirmed on Twitter that its users are "unable to access data services" and 4G coverage due to a massive data failure. "We'd encourage our customers to use wifi wherever they can and we apologise for the inconvenience caused". The Register understands the Countdown service's SIMcards are on the O2 network as is the iBus system, which tracks the location of all of London's 7000+ buses.
O2 said it would share further updates as soon as they were available. Our technical teams are working extremely hard to resolve this. Transport for London said: "The company that updates the data to our network of Countdown Systems is now experiencing difficulties in providing this service".