Trouble in Sea(Japan Coast Guard) 118
Emergency messaging service
If you're stranded and you need to leave someone a message, dial 171, then 1, then your own home phone number, then leave your message. To pick up a message, it's 171, then 2, then your home phone number (the number you think the stranded person would have left).
NHK TV messaging service
If you want to send a message to someone in the affected areas where all phone lines are down, NHK will broadcast your message on their TV service. The numbers on which to place your message are 03 5452 8800, or 050 3369 9680.
If you're still having trouble with your gas supply, call Tokyo Gas on 0570 002211 (03 5722 0111 from mobile phones).
Free translation for non-Japanese speakers
A free translation service has been set up for non-Japanese speakers, on 050 5814 7230 and 03 5366 6001. English, Chinese, Korean are available 24 hours a day. Portuguese and Spanish between 9am-8pm. Please note that this isn't an emergency information service.