The United States Federal Communications Commission on Wednesday announced that T-Mobile has agreed to a penalty of $48 million for misleading customers about restrictions on its so-called unlimited data plans. The company failed to inform subscribers to unlimited plans on its wireless networks and those of MetroPCS, which it owns, that their data bandwidth would be throttled when they hit a preset ceiling. Through its advertising and statements, T-Mobile may have led customers to expect better and faster service than their unlimited plans actually provided, according to the FCC.