KB, MB and GB are measurements used to quantify how much data has been sent or received by your phone.
Bytes are the smallest unit of data that we record. A Kilobyte (KB) is 1,024 Bytes. One Megabyte (MB) is 1,024 Kilobytes and one Gigabyte (GB) is equal to 1,024 Megabytes.
Many people think that there are 1000 kilobytes in a megabyte, so on and so forth. However, computers use the binary numbering system. That means quantities of data are measured in powers of 2.