I live in the Caribbean but i use a T-mobile 8100 on the C&W network (Barbados) I uprated my O.S last week Saturday and although i swore it would fail in a matter of seconds, my phone is running the new OS wonderfully, dare i say better than the 4.2. All i did was remove color pearl and format my SD card. I updated with thw C&W download but changed the vendor file bacc to T-mobile before the installation. Anyway wish you guys the best of lucc.