Why does my SMS inbox suddenly become smaller? It used to be 65, but now it can only be 25. How painful!

If it exists in the card, the memory of the card is limited. For example, 16K card and 32K card. The capacity of this card includes not only the storage capacity of short messages, but also the storage capacity of address books. Moreover, not only receiving SMS will occupy memory, but sending SMS will also occupy memory if it is placed in the outbox.

So you need to check whether your card is caused by the above reasons. If it is because the address book and outbox occupy memory, then you should try to move them to your mobile phone, replace the memory of the card with the memory of the mobile phone, or go to the mobile company to ask for a 32K card.