“Second is the new Minute” – one of the nice tag lines of GSM mobile service of TATA, DOCOMO.
From the first day, when mobile operators started their business, the pulse was 1 minute. Wait! Let me time travel to the old days, when there was no mobile phone, and we have popular (BTW, not that much popular as mobile phones) communication medium – telephone (the fixed line wala). And the pulses are similar to this – local calls (mostly within the city or area, which comes under same STD code, when you don’t need to add STD code while dialing) 3 minutes and STD calls pulses were varying from some seconds (not sure how much second in minimum – I have seen 15 seconds as the minimum) to one minutes.