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This is a known problem with the current Android 5.1 update and screen protectors. The problem is related to screen protectors affecting proximity sensing that normally turns off the screen when it is close to your face. There are a couple of solutions: Remove the screen protector Set the Power Button Ends Call setting under Settings > Accessibility.
"Most" calls to numbers in the US and Canada are free through Hangouts as long as you are also in the US/Canada. This is noted in Google's support pages and you can find all of the rates on this page. You need the Hangouts Dialer app in order to place a call. There is no specific listing of the US/Canada numbers that incur a charge (it's $0.01 per minute), ...
This icon comes from Sprint's HD Voice feature. The "Attempting HD" icon appears in all calls, but the feature only activates on Sprint-to-Sprint calls where both devices are supported.
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