Here at GSMArena.com we aim to bring you concise and accurate information on phone specifications. However, that's not always easy because many phones have a roster of regional and carrier versions that make the whole thing pretty confusing. To address this, we're introducing versions. Phone pages on the desktop and mobile site will have tabs that let you switch between the various versions of that device. This functionality is available on the comparison pages as well, allowing you to, for example, compare the T-Mobile USA versions of select phones or even just compare two versions of the...
Source: http://www.gsmarena.com/introducing_versions_phone_variations_tabulated-news-25177.php