Nokia has confirmed that its Lumia 710 Windows Phone handset is suffering from an issue that appears to show that a call is still connected, even if the user hangs-up, adding that it is analysing the issue and is “close to a fix”.

Lumia 710 users have taken to Nokia’s forums to report a bug that fails to end a call when the ‘End Call’ button is pressed on the handset, leading many to believe that they were being charged for additional call time despite trying to hang up.

In order to end the call, many users resorted to powering off their Lumia 710 to terminate it, as it appeared the call would remain connected until they did so.

However, Nokia has moved to reassure users that it is a display bug and Lumia 710 owners aren’t incurring additional charges to their mobile bill. Official Nokia Support representative ‘Unwired’ issued the following statement, detailing the issue:

One other important fact about this issue is that the phone modem is responding to the call disconnect signal from the touch display, the call is taken down as it should.  The issue is that the user interface displays the call disconnect button but is should not.  Consequently consumer are not being excessively billed for a call that seems to be staying up.

The Nokia Support rep also noted that the company was “continuing to analyze this software issue” and “is close to a fix.” The fix will be made available via Zune, but according to Unwired “it is difficult to say when.”

If you are experiencing this bug, the good news is that you it’s a software display issue. However, it does mean that until it is fixed, you will have to resort to power-cycling your phone to rid yourself of the hanging call screen.

It’s not the first time that Nokia has seen issues on its Windows Phone handsets, with the Lumia 800 suffering for a number of problems, most notably a battery that wouldn’t allow users to turn on their device if the battery had drained.

Nokia is already in the process of updating the Lumia 800, the company needs to get another new update out to the Lumia 710 or risking frustrating its customers further.