You can connect up to 10 Wi-Fi enabled devices like laptops, smartphones and tablets to the AT&T Home Base. Keep in mind the device you connect to the AT&T Home Base, such as a smartphone, will not use its own data plan. Instead, it will use the data you purchased as part of your Wireless Home Internet plan. All devices that are connected to the AT&T Home Base (via Wi-Fi or Ethernet) will use the data included in your Wireless Home Internet plan.
The AT&T Home Base has a web user interface (see the User Guide for details) to check your data usage each month, or you can go to att.com/myatt.