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The electric current in the hotels is 220 volts 50 cycles. A transformer is necessary to convert local power to Japan standard. An adapter is needed for plugs, as European plugs are different from the ones in Japan.
Be sure to check that your appliance is the type that works well with a particular converter. It's better to look to see, if you buy hair dryer, curling iron, etc, that they are for use on both voltage systems. Remember, the small adapter will not convert the voltage so be sure your appliance is OK for 220 volts before plugging it, or you'll see the sparks fly.

You can easily find spot where provides free WiFi in cafes and restaurants. You can get also as an Android, Blackberry, i Phone or i Pad app which stores the location of the Wi-Fi hotspots on your phone, so that you can find them when you travel and do not have internet access.