These icons appear on the mobile next to the network bars and reflect the type of mobile network you are connected to.
It is a new technology for the transmission of information
These are English terms that refer to the deposit and withdrawal of money.
MB (Megabytes) and GB (Gigabytes, 1GB = 1024 MB) are the amount of Internet data that you can consume on the mobile network.
The mobile signal "A" (or "home") is the strength of the signal received by a mobile telephone of the mobile network to which it is connected.