Grandma checks her smartphone as she walks with grandpa in Beijing on Nov 6, 2015.[Photo by Song Jingli/chinadaily.com.cn].

Although there are no specific demographic data on who bought these phones, I guess, grandpapas, nannies, migrant workers, farmers and many others, who were traditionally assumed as laggards or even non-adopters of innovative products, were among them.

One day, when I was trying to put on my first-generation Mi Band 1, a step and sleep tracker produced by a Xiaomi eco-system company, my mother-in-law asked what that was.

I told her and said this one was old as the second-generation has already come to the market.

"The Mi Band 1s could monitor your heart rates." I said.

"How much is that?"

"Ninety-nine yuan." " Jawbone’s UP3, a similar one, retails at $179.99,” I added.

"Oh, really? I want one."

"A band like this that can track my blood pressure would be better," she said.

Although I wasn’t sure, I said," what you want is not in the market now."

"It does not matter, I can wait."