Does the phone card memory have anything to do with the mobile phone?

Phone card memory has nothing to do with mobile phone.

Generally, there is a certain storage space on calling cards, such as 32k, 64k, 128k. The larger the number, the larger the storage space, which is mainly used to store address books and short messages, but the number is limited.

This is just a way to save the number. Storing short messages is mainly used to receive information when the phone is turned off, and has nothing to do with the phone.