Why didn't I see a 2 1g mobile phone in Xiaomi official website?

Xiaomi's investment means that Xiaomi is its shareholder, which does not mean that the brand is operated by Xiaomi itself. You said that the 2 1g mobile phone could not be found in Xiaomi official website, which means that this brand is not Xiaomi's and has nothing to do with Xiaomi. Xiaomi just invests money in their own operations. The problem is that they are responsible for it.

Extended answer:

2 1g mobile phone is a simple and easy-to-use large-screen mobile phone specially tailored for the elderly, which is sold in JD.COM, Taobao and other major online platforms, and is often sold out and received rave reviews. It was rated as "the magic machine in the old man-machine" and "the fighter in the domestic machine" by users. In addition to the basic needs of the elderly, such as large font, large volume, short message handwriting/voice input, low power consumption, Facebook address book and so on. This 2 1 g mobile phone is also equipped with personal assistant, pedometer, almanac, weather forecast, flashlight and other applications related to the life of the elderly. In 20 14, 2 1g mobile phone officially launched the second generation product M2, which is a smart phone specially designed for the elderly.