Why does the home page of my Galaxy S4 have a bright green light at the top plus I have no connection to network?

[AC Question]

home page of Galaxy S4 has a bright green light at the top plus I have no connection to network

a circle with a line through it icon has also appeared

 

[B. Diddy]

Re: home page of Galaxy S4 has a bright green light at the top plus I have no connection to network

Welcome to Android Central! I assume the green light is coming from the notification LED, correct? And no connection to network refers to mobile data (3G/4G)? How about voice signal--can you make calls? What about wi-fi?

I would focus on the SIM card--it might have gone bad. Contact your carrier.