My cell phone has really bad reception. I have bad reception with my cell phone. 我的手机信号很差。
My cell phone has no signal here. 我的手机在这儿没信号。
Youre breaking up. Hang up. I will call you back. 信号断断续续的，先挂上，我再打给你。
中途断线: dropped call.
手机快没电了: My cell phone is running out of battery. 也可以说 My cell phone is running out of juice.
手机完全没电了. My phone ran out of battery.
手机正充电呢 Im charging it.
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