So far we've been pretty skeptical of the budget iPhone leaks as they bear a very strong resemblance to a certain China-built Android phone. This, however, could be the money shot - the plastic budget iPhone with FCC labels on the back. None of the other leaks we've seen (and there have been plenty) had such labels. The labels could, of course, be faked quite easily (especially in a blurry...
Source: http://www.gsmarena.com/another_budget_iphone_photo_leaks_this_time_with_fcc_labels-news-6468.php
