Wilson Pro 70 Plus Professional Cell Phone Signal Booster for large buildings Boosts cell phone signal inside a building or large area up to 50,000 sq. ft. Works with all cellular devices and all carriers (AT&T, Verizon, Spring, T-Mobile, etc.) simultaneously Supports all 4G services (LTE, HSPA+. GSM, CDMA, etc.) as well as 3G and 2G Graphical uplink & downlink power meter Self-optimizing design minimizes install time Better talk, text, and cellular-based Internet speeds.