For one thing, American stock exchanges cannot list the shares of overseas companies that do not follow America's generallyacceptedaccountingprinciples(GAAP).
The prospects and desirability of convergence between U.S. GenerallyAcceptedAccountingPrinciples(GAAP) and International Financial Reporting Standards (IFRS) have been much debated, but the SEC has not yet decided whether and how to proceed.
Summary: Although convergence between US generallyacceptedaccountingprinciples(GAAP) and International Financial Reporting Standards (IFRS) has been the subject of much debate and collaborative effort, it is still unclear when the US Securities and Exchange Commission (SEC) will make a determination about how to proceed, or what its final decision is likely to be.
In order to provide comparability with the results of other US wireless carriers, all financial amounts are in US dollars and are based on accountingprinciplesgenerallyaccepted in the United States ("GAAP").