Basic knowledge about GSM mobile phones

The confidentiality of the GSM mobile phone is much higher than that of the analog phone, and the model is rich and colorful, with the global roaming function. It has become the first choice for users.
Pay attention to the following when using a GSM mobile phone:

1. In addition to the locking function, the GSM mobile phone can also lock the card. After locking the phone, forget the password to solve the problem through the encryptor of various models. But if the PIN code lock is the lock card, because of the GSM-SIM card self-protection function, after three wrong pin code, the mobile phone requires the input pukcode, and then enter the wrong Ten pukcode. So sorry, your card is over. At this time, Ericsson 388 will display SIM card blacked, and Panasonic g500 will show SIM erorr and so on, indicating that SIM has been burned out.

2. GSM phones should not be used next to program-controlled phones, because the interference between GSM phones and program-controlled phones is so great that neither party can hear them clearly.

Maintenance

The following suggestions help you observe the maintenance terms so that your mobile phone can be used for many years. When using mobile phones, batteries, chargers or accessories:

1. Place the mobile phone, its parts and accessories in a place that the child cannot touch.

2. Keep your mobile phone dry. Rain, moisture, and liquid containing minerals may corrode electronic circuit boards.

3. Do not use or store your phone in a dusty or unclean place, which may damage its detachable parts.

4. Do not store your phone in a overheated location. High temperature can shorten the lifetime of electronic devices, destroy the battery, and make some plastic parts deform or melt.

5. Do not store your phone in a cold place. When the phone temperature rises, the phone will form a tidal wave, which will destroy the circuit board.

6. Do not try to split the phone. Non-professional processing of mobile phones will damage the mobile phone.

7. Do not drop, tap, or vibrate your phone. If the phone is rudely treated, the internal circuit board will be destroyed.

8. Do not use strong chemical products, cleaning agents, or strong detergents to clean mobile phones.

9. If the mobile phone or any of its parts cannot work properly, take it to the nearest qualified service provider for repair.

What are precautions for using a GSM mobile phone?

1. using a mobile phone on the plane may interfere with the aircraft's communication network, endangering the plane's safety. Please turn off your mobile phone before boarding the plane.

2. Close your mobile phone at gas stations, chemical plants, oil depots, and blasting sites.

3. When using a mobile phone, do not approach a personal pacemaker or hearing aid.

4. Exercise caution when using your mobile phone during driving to avoid affecting traffic safety.

5. Protect your mobile phone from violent sun and rain.

6. Unauthorized installation of non-conforming antennas or antenna changes, including damaged mobile phones, seriously affecting the operating efficiency of mobile phones.

Will the GSM digital phone be eavesdropped during sending?
A: No. Although radio waves can be listened and emitted without affecting the operator's equipment. However, GSM digital mobile phones have strong security and confidentiality measures. First, it dynamically assigns a temporary user ID to the user to protect the user's identity, to prevent user location leakage. Second, the GSM digital cellular mobile phone system encrypts wireless paths, especially all user information, to prevent third-party eavesdropping. Even if the signal is received by other radio receivers, it cannot be restored to the original one.