How to solve the problem when the SIM card prompts that the storage is full?

There are two main reasons why the SIM card prompts that the storage is full:

Solution

1. The storage space of the SIM card is full.

①. You can copy the text messages stored on the SIM card to the mobile phone, and then delete the text messages on the SIM card, so as to free up a certain amount of memory space for the SIM card.

②. You can copy the phone numbers stored in the SIM card to the mobile phone, and then delete the unimportant phone numbers on the SIM card, so as to free up a certain amount of memory space for the SIM card.

2. The SIM card chip is faulty. After handling the above situation, if it still prompts that the storage is full, then the SIM card chip is faulty and the storage space cannot be obtained correctly.

In this case, you can go to the operator to replace the SIM card and replace it with a new SIM card to solve the problem.

Note: The storage space of the SIM card is not the memory of the phone body or the SD card memory of the phone. Generally, there will be a capacity mark on the SIM card, as shown in the figure:

Extended

The SIM card is a chip card equipped with a microprocessor. It has 5 modules inside, and each module corresponds to a function: microprocessor CPU (8-bit), program memory ROM ( 3~8kbit), working memory RAM (6~16kbit) data memory EEPROM (128~256kbit) and serial communication unit. These five modules are glued and sealed in the SIM card copper interface in the same way as ordinary IC cards. These five modules must be integrated into an integrated circuit, otherwise their security will be threatened, because the connections between the chips may become important clues to illegal access and theft of SIM cards.

The power supply of SIM cards is divided into 5V (issued before 1998), 5V and 3V compatible, 3V, 1.8V, etc. Of course, these cards must be used in conjunction with the corresponding mobile phone, that is, the SIM card power supply generated by the mobile phone The voltage matches the voltage required by that SIM card. After the SIM card is inserted into the mobile phone, the power port provides power to each module in the SIM card.

The signal to detect the presence or absence of the SIM card is only generated when the phone is turned on. When the SIM card is not detected when the phone is turned on, it will prompt "Insert SIM card"; if it is detected that the SIM card exists, but the card is not present, When the SIM card does not respond to the power-on detection signal, the mobile phone will also prompt "Insert SIM card"; when the SIM card falls out during power-on use, due to looseness and poor contact Or when using a scrapped card, the phone will prompt "SIM card error".

SIM card storage capacities include 8KB, 16KB, 32KB, 64KB, and even 1MB. Mostly 16KB and 32KB. How many phone numbers and text messages a SIM card can store depends on the capacity of the data memory EEPROM in the card.