Asymco:

The iPhone is the best selling product ever, making Apple perhaps the best business ever. Because of the iPhone, Apple has managed to survive to a relatively old age. Not only did it build a device base well over 1 billion it engendered loyalty and satisfaction described only by superlatives.

The changes ushered by the iPhone have been as momentous as those of the Ford Model T. Or those of electricity, telegraph, radio or TV.

I don’t think it’s hyperbole to call the iPhone the most influential product of the 21st century so far. Something may come along in the next eighty years to supplant it but right now, its importance can’t be overstated.