Is sprint open on July 4th?

It depends on your area but companies don't normally shut down for 4th of July because it's not considered a Holiday that requires leave like Christmas. And even then most worldwide companies are open. Yes, AT&T should be open but it would probably be easier just to drive down and check since each store is different. If you're talking about they're customer service line, yes it would be since most of your calls are sent out of the country anyway.