How big is the memory of a general mobile phone card and how many numbers can it store?

The back of the ordinary mobile phone card is marked with its storage space.

My card has 64K space.

The calculation of their storage space, if you have studied information technology, you will know.

1G = 1024m 1M = 1024 kb 1KB = 1024 b

The calculation of computer storage space is the same as that of memory card.

A Chinese character takes up two bytes, a letter takes up one byte and a number takes up two bytes.

1KB can store 5 12 Chinese characters, numbers and letters and 1024 characters.

So how much my 64K can save depends on it.