Definition of phreaking noun from the Oxford Advanced Learner's Dictionary

 

phreaking

 noun
noun
BrE BrE//ˈfriːkɪŋ//
 
; NAmE NAmE//ˈfriːkɪŋ//
 
[uncountable](informal, especially North American English)
 
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the act of getting into a communications system illegally, usually in order to make telephone calls without paying Word Origin 1970s: alteration of freaking (see freak). The change from f- to ph- was due to association with phone ‘telephone’.
See the Oxford Advanced American Dictionary entry: phreaking