Here's something to ponder: you're talking on a cell phone to someone, and the call's not going well - not an arguement - but they're clearly disappointed in something you've done, and while they're letting you have it, the call gets dropped. Do you call them back right away once you get back in range? Or do you let someone that's already unhappy remain that way? How do you resume a conversation like that, if you do decide to call back?
Sometimes cell phones create more problems than they solve.