Local collect calls are dialed with the 9090 prefix; so, to call nnnn-nnnn collect, one would dial 9090-nnnn-nnnn .For long-distance collect calls, 90 is instead of 0 as the trunk code, and a carrier selection code must still be used. So, to call (aa) nnnn-nnnn collect, one would dial 90-xx-aa-nnnn-nnnn , where xx is to be replaced by the selected long-distance carrier's code. International collect calls, for countries for which it is available, are not automated and must be placed through Embratel's international operator, dialing 0800-703-2111 . You can also call an English AT&T operator directly using 0 800 890 0288