Will the information stored in the SIM card be lost after the card is taken out?

If you are sure that your information is stored in the SIM card.

Then the information will run with that card, which phone you insert the card into, and then the information will be seen on which phone.

No matter how long it is saved, as long as it is not deleted, the information will not be lost, even if it is taken out n times, as long as it is not deleted! Yes, forever!

It shouldn't be that there is less information in your card, it should be in your mobile phone. Sometimes if the information stored in your card is full, it will be automatically stored in your mobile phone.

As for the last case you mentioned, it should be that there is something wrong with the storage function of your mobile phone, not the card!