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In Japan, some televisions and radios seem to be capable of getting out of sleep mode if a tsunami warning is issued.

If tsunami warnings are issued, the Emergency Warning Broadcast system utilizes 1seg to automatically turn on (and tune to NHK) all radios and televisions with 1seg technology in the areas at risk. All warnings are broadcast in five languages: English, Mandarin, Korean and Portuguese, as well as Japanese.[17]

Here is the definition of sleep mode from wikipedia

Sleep mode is a low power mode for electronic devices such as computers, televisions, and remote controlled devices. These modes save significantly on electrical consumption compared to leaving a device fully on and, upon resume, allow the user to avoid having to reissue instructions or to wait for a machine to reboot. Many devices signify this power mode with a pulsed or red colored LED power light.

However, I would like to know if similar technology has been deployed in Japan for some cell phones. I heard rumors that this was the case also, but the wikipedia article seems unclear about this (and unfortunately, several of the references listed at the end of the wikipedia article are in Japanese).

Just to be clear. I'm not looking for a sleep mode on a cell phone. I realize that if the led light on a cell phone is on, it can still receive messages and commands. I'm especially looking to know if a Tsunami warning can turn on some Japanese phones that were previously turned "off" with the power button.

Please note that I do not care to know if it is possible. Nor do I care if the NSA can do it. I am only looking for evidence, either first-hand accounts or a written source, that this kind of turning-on technology has been at least partially implemented in Japan for tsunami early warnings on some cell phones at least.

Lacking this evidence, I'll settle for anyone who went through a tsunami warning in Japan these past couple of years (without hearing about cell phones turning themselves on. If this had been really the case, I would assume that Japanese people would have talked about it amongst themselves).

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