1. My cell phone has really bad reception.

　　I have bad reception with my cell phone.

　　我的手机信号很差。

　　2. My cell phone has no signal here.

　　我的手机在这儿没信号。

　　3. You're breaking up. Hang up. I will call you back.

　　信号断断续续的，先挂上，我再打给你。