"Some handsets can't be fully powered down without removing the battery; for instance, some Nokia models will wake up when turned off if an alarm is set." (http://news.cnet.com/2100-1029-6140191.html) I'm guessing that there even might be models with built in battery backup for this kind of functionality.
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[ 5.4 ms ] story [ 20.6 ms ] threadhttp://www.endoacustica.com/gsm_interceptor_en.htm