The other cities in the list are London, Tokyo, Beijing, Seoul, New York and Mexico City.
All this is just 10 years after the cellular phone made a splash in the world market. I would say even less in the India as real mobile demand picked up only about 6-7 years ago when the mobile call rates fell from a steep 17 rupees a minute to Re 1 a minute. This was also supported by fall in prices of handsets from Rs. 35000 when they were introduced to Rs. 1500.
I don't see it would be long before we have all the major metros in this list soon.
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