Determine whether using Wi-Fi Calling or a MicroCell will be the better option for you.
Learn about Wi-Fi Calling and AT&T MicroCell
Wi-Fi Calling1 makes it possible to call directly over Wi-Fi and the Internet. It’s the best solution when cellular coverage is weak or not available inside a home or place of business. If Wi-Fi Calling is not an option, you can try AT&T MicrocellTM a signal booster that acts like a mini cellular tower.