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Identify the oldest phone hacking technique used by hackers to make free calls.

Identify the oldest phone hacking technique used by hackers to make free calls. Correct Answer Phreaking

বিনামূল্যে কল করার জন্য, হ্যাকার নিয়ন্ত্রিত ফোন কলিং পদ্ধতিকে ফ্রিকিং বলে। ১৯৭০ সালের দিকে ফ্রিকিং (phreaking) বেশ জনপ্রিয় হয়ে ওঠে। 

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