What's a mobile phone :

In today's time, the mobile phone is such a device without which no one can think of living their life. Mobile phones have made human life very easy and simple. When there were no mobile phones globally, people had to wait for many days to send messages to each other, but now in a few moments, we can convey our words from one corner of the world to another. Mobile phones have a big hand in giving a new dimension to human life.

The mobile phone is an essential electronic device in today's era. With the help of mobile phones, people can talk to anyone from anywhere.
Now there is no need to go near the telephone sets installed in homes to talk on the phone. Now people can talk from mobile phones kept in their pockets.
Earlier mobile phones used to be very expensive. But now very cheap mobile phones have also started coming. Now the mobile phone has become so cheap that almost everyone has at least one mobile phone.
Mobile phone is not only for talking, but now you can also run the internet on mobile. With the advent of the Internet, the need for computers has almost reduced.

Some good mobile phones have almost all the same features as the computer.
You can do the same work as a computer from that mobile phone.

Best Mobile phone's under 20000 in India :

IQOO Z3 :

Qualcomm Snapdragon 768G 5G processor, 7nm chip and octa-core processor.
55W FlashCharge can charge the 4400mAh battery up to 50% in just 19 minutes* and a full charge in just 50 minutes*
64MP AF Main Camera with f/1.79 Aperture supported by GW3 sensor loaded with professional features like 4K videos @ 60FPS, EFB Autofocus Tracking, and more. The device also comes with a 16MP Front Camera
120Hz Refresh Rate | 180Hz Touch Sampling Rate
The five-layer liquid cooling system can reduce the core temperature by 10 degrees.

Details :

Model Name: IQOO Z3 5G (Ace Black, 6GB RAM, 128GB Storage)
Wireless Carrier: Unlocked for All Carriers
Brand: IQOOPhones
Form: factory bar
Memory: Storage Capacity128 GB
OSFuntouch: OS 11.1 Global (Based on Android 11)
Colour: Ace Black
Cellular: Technology5G
Model: Year2021
Display Size: 6.58 Inches LCD

Buying link :

https://amzn.to/2WflFLv

Redmi Note 10 Pro :

Processor: Qualcomm Snapdragon 732G with Kryo 470 Octa-core; 8nm process; Up to 2.3GHz clock speed
Camera: 64 MP Quad Rear camera with 8MP Ultra-wide, 5MP Telemacro, and Portrait lens| 16 MP Front camera
Display: 120Hz high refresh rate FHD+ (1080x2400) AMOLED Dot display; 16.9 centimeters (6.67 inch); 20:9 aspect ratio; HDR 10 support
Battery: 5020 mAH large battery with 33W fast charger in-box and Type-C connectivity
Memory, Storage & SIM: 6GB RAM | 128GB UFS 2.2 storage expandable up to 512GB with dedicated SD card slot | Dual SIM (nano+nano) dual-standby (4G+4G)