Remember the days before everyone had a mobile phone? Some probably won't since the first generation of completely wired kids is growing up. Yet, there's still a good proportion of us who remember growing up without a phone constantly at our side. Jeez, some of us were even willing to carry a pager (remember those) with all the downsides (you were basically considered by most to be dealing in drugs!) Anyway, what I'm getting at is about etiquette. When we were growing up and you set up a place and time to meet with friends, you were there on time. Some came a bit late but generally, everyone showed up or at least called way in advance (to your home phone) to say they wouldn't make it. You came late once, we were pissed. You came late twice and you were OUT. We left and you could either come find us (highly difficult--even more so once we switched the bikes for cars) or go home.
Now, this negative stigma (and effect) of coming late is gone. People will call you five minutes before they are supposed to meet you and say they'll be a half hour late. People will cancel on you last-minute. People will try to change the game plan before even arriving. One way or another, it's pretty annoying to do anything without it becoming a project. Everyone knows you have a phone with you and they're not worried about using it. Sure, there are a ton of benefits to carrying a mobile phone. I'm definitely not arguing against them. I'm simply asking people to consider the etiquette of on-time arrival. Don't use the mobile phone as a crutch for your laziness or disregard for other peoples' time. Now again, how cool will presence be? Someone telling you they're late because they're stuck in the office or whatever will sure be interesting when they know you can see where they are. At the same time, you shut off your presence to your circle of friends or network and how quickly are you "out of the loop"? Interesting times in the mobile space.