He hasn't called - what's the deal?

[mu_agd]

So I met this guy at the bar - he seemed like a nice guy, I mean, he spoke to me haltingly, but only when the other people at his table weren't looking. On the way out, he got my phone number - he called me about 2:30am, and we hung out for a little bit. well, one thing led to another, and we smashed. well, he left before i woke up at 8am for church, but he text messaged me to say he'd call me sometime. It's been a whole day, and he hasn't called - should I be worried? Also, how can I find out his name? His friends were at the bar again last night, or at least I thought they were the guys he was with - they said they didn't know him though. I'm stumped. GC, help!