The issue seemed to affect calling landlines for several hours on Monday afternoon.
O2 released a statement at 8pm saying the problem had been resolved.
"BT has confirmed that the problem is now fixed and our customers are able to make calls successfully," the statement said.
"We will continue to monitor service overnight to ensure stability for our customers. We apologise for any inconvenience this may have caused."
Earlier, O2 acknowledged the problems on Twitter and told one user: "We're aware some customers may be unable to call EE mobiles or landlines."
In another tweet reply, it said: "Our call routing partner are investigating a problem within their network."
EE also confirmed the problem had been resolved: "Customers of a number of operators have experienced problems calling landlines for a short period.
"The issue has now been resolved."
The company had earlier tweeted: "The EE Network is currently experiencing national technical issues regarding calls and signal.
"Our engineers are fully aware of the problem and they are working to fix it as we speak."
BT said later it had investigated and there had been no issue with its network.
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