U Card Update Company: MobileLime (www.mobilelime.com) and Watertown Taxi (www.watertowntaxi.com) Card Type: Regional credit card Special Features: The unique card gives Boston cabbies the ability to accept credit cards with no equipment or start-up charges With MobileLime, passengers can pay for cab fares with their favorite credit cards using a novel mobile commerce solution, which reportedly is more convenient and provides a faster, safer