फ़ोन पे सबसे पहले 'हेलो' क्यों बोलते हैं हमलोग ? - Hello During Mobile Communication । Facttechz,  facts mirror - video Dailymotion

Name: फ़ोन पे सबसे पहले 'हेलो' क्यों बोलते हैं हमलोग ? - Hello During Mobile Communication । Facttechz, facts mirror
Uploaded: 2019-12-19T15:26:59+00:00
Duration: 6 min 1 s
Channel: Facts Mirror
Description: Why we tell "hello" On call at first.