There's a video up at 9to5 Mac which demonstrates how iPhones on Verizon and AT&T handle conference calling differently. Specifically, the CDMA-based Verizon phone is unable to jump between calls like the AT&T iPhone can.
The user began by placing a call on both phones. Once connected, a second call was initiated. The AT&T phone let the user move between calls easily, placing the non-active call on hold. Finally, each call could be terminated individually.
Meanwhile, the Verizon phone did not let the user jump between calls, and pressing the End button terminated both calls at once. We noticed that the user in the video didn't hit the Merge Calls button on either pho
