Nokia Smartphone Knowledge Encyclopedia
It can be read by novices and experts, it is absolutely useful
1. Purchase chapter Things to note when buying a mobile phone:
Things to note when going to buy a mobile phone: When buying a mobile phone, you usually pay attention to whether there are any traces of use, whether there have been any phone calls in the communication records, whether there are any messy photos, and whether the battery contacts are worn. Press the # key for more than 5 seconds to see if there is an option to switch lines; besides, check whether the screen has any dead pixels. The dead pixels on the mobile phone can be said to be directly damaged. It can be seen with the naked eye, unlike the dead pixels on a digital camera that have to go through software testing. Turn on the camera of your mobile phone and take a completely black photo, cover it with a piece of white paper and look at the light to take a completely white photo (do not take it directly against the light, it will damage the camera), and then look for any differences between the two photos. Generally speaking, there are no dead pixels. Set the time first and then remove the battery. After a few minutes, turn the phone back on to see if the time needs to be reset. The biggest difference between general licensed products and Hong Kong products is that Hong Kong products have more traditional Chinese input methods than licensed products. Then there are matters related to warranty. Hong Kong products can enjoy the three-guarantee service in the mainland with formal invoices and warranty cards issued by retailers. Generally, licensed products are much more expensive than Hong Kong products. How to choose depends on personal needs and financial strength, but you must be careful not to buy refurbished machines. Enter "*#06#" on your mobile phone to view the serial number of the mobile phone, which should be the same as the serial number in the battery slot on the back of the mobile phone, and don't forget to check the call history^o^...
