4. Read the text below and answer the questions.
In the 1980s, the first cell phones were big and heavy, like a brick. You could only use them to talk, and calls were expensive. In the 1990s, phones got smaller and lighter. This is also when texting became a popular way to chat with friends. Around the year 2000, cameras were added to cell phones, so we could take pictures with them. Cell phones got Internet access, letting us explore the web and play games in 2010s. Today, our cell phones are like small computers! We can do almost everything with them.
a. When did texting become a popular way to chat?
b. In what ways did people use the cell phones in 2010s?