Learn how to pick the best International Plan for you at our Knowledge Sharing Session: Hello World!, on Wed, Oct 25 - from 1-4pm ET / 12-3pm CT / 10am-1pm PT!
How many single lines or calls can roll into one conference call for iPhone 4?
conference call is a carrier feature, not a handset feature.
AT&T supports three way calling: http://www.wireless.att.com/learn/basics/choosing-features-services/three-way-calling.jsp
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