My cell phone has really bad reception. I have bad reception with my cell phone. 我的手機信號很差。

　　My cell phone has no signal here. 我的手機在這兒沒信號。

　　Youre breaking up. Hang up. I will call you back. 信號斷斷續續的，先掛上，我再打給你。

　　中途斷線: dropped call.

　　手機快沒電了: My cell phone is running out of battery. 也可以說 My cell phone is running out of juice.

　　手機完全沒電了. My phone ran out of battery.

　　手機正充電呢 Im charging it.