merge calls is not working in my iphone

Hello naveen_199155,

Welcome to the Apple Support Communities!

I understand that you would like to merge calls together on your iPhone, but it is not working as expected. There are a couple of different resources I would suggest reading over in this situation.

First, depending on whether you have a GSM network iPhone or a CDMA network iPhone, the Conference calls feature may work differently. Please review the first attached article for this information.

iPhone: Understanding phone features - Apple Support

Conference calls

Supports up to five calls simultaneously

Supports up to two calls simultaneously.

CDMA networks may not be able to add, swap, or merge calls in certain situations. See the iPhone user guide for more details.

Another valuable resource, just to ensure the correct steps are being taken to set up a conference call, is the iOS 8 User Guide (page 51). Please read over this for more information on the process as well as why the feature may not be working if you are using a CDMA iPhone.

manuals.info.apple.com/MANUALS/1000/MA1565/en_US/iphone_user_guide.pdf

Have a great day,

Joe

Hi naveen_199155,

In this instance, you may find more information on this issue by using another one of Apple's support resources.

https://getsupport.apple.com/GetproductgroupList.action

Best regards,

Joe