1. How to put the mobile phone card into the card slot: use the card taking pin to take out the SIM card holder, and use the card taking pin with moderate force.
2. 2. Place SIM card and memory card.
3. If a memory card needs to be inserted, the SIM card and memory card of card 2 can only be used at the same time.
4. The SIM card and the card holder should be in the same position, and the metal contact face of the SIM card should be downward.
5. 3. Put the SIM card and card holder into the phone, and insert the card holder into the card slot in parallel. Do not use excessive force.
6. Please do not use scissors as a card cutting tool, which may damage the SIM card chip.
7. It is recommended to go to the operator's business hall to change the card; Please do not use the card sleeve, which may cause damage to the SIM card chip and poor contact with the mobile phone; The SIM card cannot be inserted directly into the phone. You must insert the card holder before inserting the phone.
8. Mobile phone, or mobile phone or wireless phone, is usually called mobile phone. Originally, it was just a communication tool. In the early days, it was also commonly known as Big Brother. It is a portable telephone terminal that can be used in a wide range. It was first developed from the battlefield mobile phone manufactured by Bell Laboratories in 1940.
9. In 1958, Soviet engineers listed the year, and Martin Cooper, an American Motorola engineer, invented the world's first commercial mobile phone.
10. After the 2G era and the 3G era, it has developed to the 4G era so far, and the 5G era is also closely followed by the commercial 5G in China.