When I first switch on my Samsung S3 I get 'Virgin' in the top left hand corner of the screen. I try to make a call and it fails. when I return to the locked screen it says emergency calls only.
There is a strong signal indicating on the header bar.
Welcome to the community and thanks for posting. I'm sorry to hear you're having trouble making calls with the S3.
I've checked the masts in your area and I can see a few of them have been having trouble recently but it appears they're all up and running again now. Could you please answer the following questions:-
Have things improved your end?
Does this happen at all locations?
How do you get it off 'Emergency calls'?
Hope to hear from you soon.