One button handles most functions including call answer and redial, while a smaller button on the top edge controls volume and turns the status indicator on and off.

一个按钮控制大部分功能，包括接听电话和重拨，顶部边缘处有一个更小的按钮，用来控制音量和开启、关闭状态指示器。

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That's when you realized what had happened: Your friend had accidentally pressed the redial or speed-dial button on their cellular phone, which then placed a call to you.

那是在你明白过来是怎么回事的时候：你的一位朋友不经意地触碰了他的手机上的重拨或速拨按钮，于是拨通了你的电话。

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If you leave a Wi-Fi coverage area, the call drops, and, after a brief but annoying delay, the phone will redial the call over Sprint.

WSJ: Personal Technology: A $19 Unlimited Phone Plan

The phone even displays a button during calls, called informally "the escape hatch, " which allows you to kill the Wi-Fi call and force the phone to redial the other person over Sprint for no added charge.

WSJ: Personal Technology: A $19 Unlimited Phone Plan