With iOS 7.1.2 they changed the buttons to hold a call while you are already on the call with someone. If someone with a iPhone iOS 7.1.2 on Verizon can confirm this also in the comments that would be amazing. The steps: Be in a call with someone, then have another phone call you, and try to end the call with the current person and answer the other person, its the button at the bottom left of the screen. It pops up when the second person calls you. Please tell me if it hangs up on both of the calls, this is the problem that is happening to me, tested it on a friends device and it is glitched on his too. If anyone could confirm this that would be amazing! Thanks!