My phone's dead. My phone died.

　　bad/poor reception

　　I've got bad reception here.

　　I'm losing you

　　data，I'm out of data.

　　MB读作megs，GB读作gigs，I have 5 per month.

　　My phone keeps dropping calls.

　　no signal

　　I've got no signal/reception .

　　China XX 3G service is spotty.