Yes it's a cliche, but I can't live without my iphone. I am reluctant to say those exact words, that I "can't live without it." Perhaps that designation should be reserved for dialysis machines. But I can say that my life would be very different.
For example, I am one of those people who loathe asking for directions. Which meant I spent a fair amount of my life wandering around lost, especially when traveling. Enter the iPhone and suddenly, I am never lost, because I am only an app away from directions to my next destination via car, public transit or my own two feet.
Then there's the question of whether the restaurant you are about to enter will provide you with a good meal or a bad one. Absent the obvious signs like smell, general cleanliness, or whether the establishment is crowded, pre iPhone your choice was a gamble. With iPhone in hand, I have the collective opinions of the entire English-speaking world at my sliding fingertips. This makes me, my stomach and my dining companions much happier.
Finally, the iPhone is the ultimate argument solver. Before the days of mobile web access, you'd have to wait until you were home to “Google it” and determine which one of your friends was right about the release date of the original Footloose movie. Or you would have to stop by the library and ask to borrow the microfiche machine. However, with the ubiquitous iPhone, disagreements like this can be settled quickly, preserving friendships or, at the very least, allowing the conversation to progress to a different topic.