The mobile phone does not have a card, does not surf the Internet, and is only used as a camera. Will the information in the mobile phone be leaked?

In principle, it can't be leaked. Only your location may be known. It's just that this situation requires you to have this necessity. Just ordinary people don't have to worry.

Normally, not. Don't click on a link sent by a strange number or press the prompt button when answering a strange number. If you can do this, you won't surf the internet and basically won't leak on your mobile phone.

In other words, as long as the user keeps the mobile phone beside him, there is no confidentiality at all. The other is to implant the transceiver function into the chip during the mobile phone manufacturing process.

Mobile phone is an open communication system, and communication information can be intercepted and tracked at any time. When closed, it can be opened by remote control to reveal the sound within a certain distance. After the information in the old mobile phone is deleted, it can be recovered by technical means.