There is no scientific basis for the previous statement that mobile phones may cause degaussing of credit cards, and no one's credit cards are truly degaussed because of mobile phones. Especially for the credit cards issued now, the anti-interference ability of magnetic stripe is greatly enhanced. Hi co's logo can be seen on the back of the credit card, indicating strong magnetism. Some people call the card with this word "high diamagnetic bank card" (the early bank card was not a high magnetic card, but this card disappeared earlier). Besides, neither the mobile phone nor P3 is a strong magnet. Without a strong magnetic field, credit cards will not be demagnetized at all. It has been tested and reported on CCTV-2. As for putting the mobile phone and P3 together, that's even more no problem.