Mid of 2013 would be PERFECT for me. 
My mobile Wifi contract (LTE) will end in summer 2013 and I would direct jump to a iPhone 5s with tethering which is now officially possible in Japan; without big risk of huge payments. Seven month to go.
My mobile Wifi contract (LTE) will end in summer 2013 and I would direct jump to a iPhone 5s with tethering which is now officially possible in Japan; without big risk of huge payments. Seven month to go.