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Warning: Dont use HTC One X without SIM installed

Thanks for the tip. :)

It's most likely because it's looking for a signal. Once of the biggest reasons for battery drain is poor signal. If the phone can't get what it thinks is an acceptable signal, it will push more power to the radio in an effort to get one. If you've no SIM installed, you've no signal which is going to kill the battery pretty quickly.
 
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