ATT customers can now access LTE data speeds when visiting Canada thanks to a newly announced pact with Rogers. This marks the first time that a major US carrier has offered the option of international LTE roaming. ATT describes the Rogers LTE network as the fastest in Canada, claiming that it reaches 70 percent of Canadians and continues to expand. The carrier says all of its existing LTE-capable smartphones will run on Rogers without a problem, but dont expect LTE roaming to come cheap.