Hundreds of people across the UK have been reporting problems with their O2 network.
Everything from making calls to sending messages has been tweeted to the official O2 Twitter account.
One frustrated customer said: "why can’t I make calls but I can send texts and iMessages"
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Another added: "What's going on with the network? Can't make outbound calls. Is this a national issue?"
The mobile provider has been forced to respond to unhappy customers on the social media network.
Responding to concerns and complaints, O2 said: "We've seen some reports of customers unable to make or receive voice calls, which is being investigated as high priority. We'll share any updates as they become available on our status checker here https://status.o2.co.uk/ "
On their website they said: "We’re aware of an issue impacting voice services. Our technical teams are investigating. We apologise for any inconvenience. Updates will be shared here as soon as they are available."
