The electromagnetic frequency emitted by mobile phones is generally very small, which is not enough to change the magnetic field of the magnetic stripe information on the card. Even long-term contact will not demagnetize the card, because the strength of the magnetic field has nothing to do with the length of time.

To prevent the card from degaussing, please pay attention to the following four items:

Although smart card degaussing is not so easy, it will still bring us a lot of trouble once degaussing. In life, how to protect smart cards from degaussing, please pay attention to the following four points:

1. Don't bend the smart card or throw it in a messy bag to prevent sharp objects from wearing, scratching or twisting the magnetic stripe.

2. Don't be close to high temperature environment. Usually, smart cards are made of PVC. High temperature will deform or even burn PVC, which will directly damage the chip or magnetic stripe.

3. Do not leave the smart card in a humid environment for a long time. Although smart cards can be placed in water, after all, smart cards are made of multi-layer PVC materials, which will lead to card opening if they are placed in humid environment or water for a long time.

4. Some bags and some medical examination equipment such as magnetic hidden buttons of nuclear magnetic resonance instrument can also lead to degaussing of smart cards, especially bank cards. A better way to protect bank cards is to put them in a special antimagnetic card case or keep them in a card bag separately.