Final answer:
An iPhone fits into the Education and Communication category of the CPI, which tracks expenses such as phone services and technology products.
Step-by-step explanation:
An iPhone would be categorized in the Education and Communication category of the Consumer Price Index (CPI). This category includes expenses related to school tuition, postage, phone services, computers and accessories. Since an iPhone is a communication device and falls under the technology products (like computers and accessories), it is part of the Education and Communication goods and services group.
The CPI uses these categories to monitor changes in the cost of living, helping to understand economic inflation and the spending habits of consumers.