Unable to merge calls in iphone 6

[iMore Question]

when i try to add two calls, my merge button does not works in iphone 6

 

[Tartarus]

It could be that your carrier is not supporting this. Contact your carrier for more information.

 

[comiken205]

How are you trying to merge? You make a call, place the person on hold, call second number and then merge? If that is not working, like Tartarus said, you need to have your provider enable that option for you.