Yeah, if I'm in the middle of catching up with an old friend, I'll just feel my cell phone vibrate and ignore it.

Once we're seated and the initial greeting is over I'd check my phone really quick to make sure it wasn't anything urgent, but I wouldn't brush off the friend I bumped into to talk my other friend.

Especially if I'm at a restaurant. Conversation with someone at your table is fine, but it seems like a conversation with someone on your cell phone at a restaurant can become rude.

I guess that's mostly because people on their cell phone seem to talk more loudly than when they talk face to face.