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How many participants can be added for IPhone 5 conference call?
3 total callers at once (including you) only is possible with Verizon iPhone 5. The limitation is the Verizon CDMA network, not the iPhone. With Advanced Calling 1.0 (VoLTE) available on the iPhone 6 and 6 Plus, you can have up to 6 total callers at once.