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Apr 3, 2015 8:31 AM in response to jkor17by FoxFifth,It depends on whether you have a GSM or CDMA carrier. Per the following GSM will support up to 5 and CDMA only 2. iPhone: Understanding phone features - Apple Support
The following instructions are from the User Guide:
https://manuals.info.apple.com/MANUALS/1000/MA1565/en_US/iphone_user_guide.pdf
Conference calls
With GSM, you can set up a conference call with up to five people (depending on your carrier). Note: Conference calls may not be available if your call is using VoLTE (Voice over LTE).
Create a conference call. While on a call, tap Add Call, make another call, then tap Merge Calls. Repeat to add more people to the conference.
- Drop one person: Tap next to a person, then tap End.
- Talk privately with one person: Tap , then tap Private next to the person. Tap Merge Calls to
resume the conference.
- Add an incoming caller: Tap Hold Call + Answer, then tap Merge Calls.