I have an old phone. Not as old as those flip-phones, but older than smartphones. I get a bit embarrassed taking my phone out in public.
It seems like a lot of people use their phones to communicate with friends, using texting, apps, IM services, playing games, and whatever other ways there are to reach your friends.
So when they see my phone I feel like they think "Oh, he has an old phone because he doesn't have any friends." I think "poor" would also be another assumption they would make. They wouldn't be necessarily wrong either.