A relic is an object of religious importance. So yes, calling a payphone a relic is using it as a slang term.
Listen, I wasn't trying to hurt your feeling or "prick your conscience," I only meant that when I see that you've responded to an "out there" or "tryndee" sort of name, I already know that you're going to hate it and that your response will likely reveal such via some snide comments. That's fine, really it is. Your opinions aren't wrong and by god they are definitely consistent. I can respect that. It's just that after a while I don't find them particularly helpful because I just keep hearing the same things over and over again. Normally I'm like "ooo hey a new comment!" then I see that it's from RoxStar and I'm more like "sigh, ok, what's she gonna say about this one" I really meant no harm, just wanted you to know