ATT Inc, the No. 2 U.S. mobile provider, on Saturday announced a price cut for customers who share large data plans in its latest attempt to regain ground lost to market leader Verizon Wireless and No. 4 U.S. operator T-Mobile US. In what the company called its best-ever prices, ATT said a family of four can get unlimited talk and text with 10GB of shared data for $160 a month. The discounts are available to any customer, including small businesses with up to 10 lines, and customers of other carriers who switch to ATT. The cuts follow recent price adjustments at all four U.S. wireless providers as they attempt to sustain growth in a mature market built on stealing growth from competitors. ATT and T-Mobile U.S. have been competing fiercely.