Listen to the following explanation on smartphone evolution: "The evolution of smartphones has been rapid. Early smartphones primarily focused on communication, offering basic calls and text messages. However, modern smartphones are now powerful multi-functional devices, integrating high-resolution cameras, internet browsing capabilities, advanced gaming, and a vast ecosystem of applications, essentially becoming pocket-sized computers."
What is a significant difference between early and modern smartphones, according to the text?
A) Early smartphones were more expensive.
B) Modern smartphones are primarily used for making calls.
C) Early smartphones had better battery life.
D) Modern smartphones offer a wider range of integrated functions beyond basic communication.
E) Both early and modern smartphones lacked cameras.