More European mobile operators should offer free international roaming, following the example set by U.S. operator T-Mobile, a European Commission vice president said Monday. After enforcing a series of reductions in voice and data roaming charges across the European Union over the last four years, the latest round of which takes effect Tuesday, Neelie Kroes is ready to take the ultimate step of abolishing roaming charges entirely by late 2015. She hopes to win the support of national telecommunications ministers for that by the end of this year. From Tuesday, European mobile roamers will see a big cut in the cost of roaming, with data charges dropping 55 percent or more compared to last summer.