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What to do when add call button is disabled on the Lenovo K4 Note?

'Add Call' button is disabled even when call is running and due to this unable to make conference call,please help, fed up with lenovo k4ed even when call is running and due to this unable to make conference call,




I believe that is disabled by the carrier. But to be sure, please try using other phone/dialer app. Let me know what you find out.



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