AT&T MicroCell is designed to give you more bars in your most important spaces. It's great for areas in the home where cellphone users may experience reduced signal strength. It's like having a mini cell tower right in your home. Your voice and data usage counts toward your individual or Mobile Share Wireless Plan, the same as it is when you are away from the home. Up to four AT&T phones can use the MicroCell for voice calls or data sessions at the same time. You can also give your friends access to the device on their AT&T cellphones while they're visiting.