If you have Android 8.0 or later, your phone should come equipped with Data Saver mode, which kicks in when you are not on Wi-Fi and ensures that apps and services that are not being actively used won’t be able to stream data in the background.
It is very easy to turn Data Saver mode on and off. To do this,
Mobile data is internet content accessed by, or delivered to your phone over a wireless/cellular (i.e. mobile) connection. When you purchase mobile data plans, you are entitled to a certain amount of data over a fixed period of time. You can also access the internet through Wi-Fi connections depending on whether you have access to that particular Wi-Fi network. With mobile data however, you can use the internet as long as your phone can detect your network’s data signals, and you have an active data plan on that network.
Internet data is a service provided by telecom service operators to the end users to enable them access the internet. The speed of the access and the nature of activities which the consumer can carry out often depends on the nature of the technology in use. Access technologies are usually classified into "Generations" to denote their age and characteristics, as follows: