Final answer:
The main difference between early 2000s cell phones and the first iPhone was that the latter featured a big touchscreen and a multitude of apps, in contrast to the small screens and physical keyboards of earlier phones.
Step-by-step explanation:
The cell phones of the early 2000s and Apple's first iPhone, which was introduced in 2007, were notably different in several ways. One of the primary distinctions can be underscored through the choice A:
- Cell phones in the early 2000s had a physical keyboard and a very small screen, while the first iPhone had a big touchscreen and many apps.
This observation is accurate because traditional cell phones before the iPhone often featured physical buttons or a small keyboard for typing, and displays were relatively limited in size and functionality. In contrast, the iPhone revolutionized the industry with its large touchscreen interface facilitating a wide range of applications, allowing for more versatile operations, and enabling an intuitive user experience that mimicked a mini-computer.