Which of the following is NOT a function of smartphones?

Smartphones are multifunctional devices that offer a wide range of capabilities, and among those listed, printing photos is typically not a direct function of smartphones. While smartphones are equipped to take photos, edit them, and share them via various applications, they do not have the built-in capability to print photos on their own. Instead, users can connect their smartphones to a printer, use cloud services, or transfer images to a computer to achieve printing. This distinction highlights why printing photos is not a core function of a smartphone, unlike the other options presented that directly utilize the smartphone's inherent features. Making calls, playing video games, and sending emails are all primary functions that smartphones are specifically designed to handle.