Who are the dudes at Lake Austin HEB that are always hanging out on L1?

During the day I always see these guys, late 20s, early 30s, dressed in what I’d call “baseball chic” - they’re always sitting near the up escalators and they ALL have 2 phones. They talk in groups, but the mystery deepens. Who are they? Why do they hang out at HEB? And why 2 phones?