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is underclocking dangerous?

I don't think it can do any harm but you may encounter erratic behavior and freezes on the phone if you take things down too far. They'll be a minimum level where functionality and usage need to be maintained for the system. Unless you want to save a bit of battery power on a dual core handset or better, it's not that useful if you want to continue using your device as a smartphone on demand.
 
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Smartphones