The Deutsche Telekom pavilion at Mobile World Congress in Barcelona, Spain. Angel Garcia | Bloomberg | Getty Images BARCELONA — Europe's telecommunication firms are ramping up calls for more industry consolidation to help the region compete more effectively with superpowers like the U.S. and China on key technologies like 5G and artificial intelligence. Last week at the Mobile World Congress (MWC) trade show in Barcelona, CEOs of several telecoms firms called on regulators to make it easier for them to combine their operations with other businesses and reduce the overall number of carriers operating across the continent. Currently, there are...