Will the new machine be used for a second time? Will you quickly detect problems other than scratches?

In the first half of this year, Android smartphones have been released. We do not know how many small partners have already started with the kingship or flagship of 2017. Originally, Xiao Bian also wanted to buy a belief machine and feel the power of Xia Long 835. However, when he was holding a coin for purchase, he was stopped by Xiao Zhi (micro signal: zhiqudog), a neighboring table.

He said: Do not hurry to buy a new machine, fish, ah, there will inevitably be impulse consumption in the forum or we will quickly get used to fresh out of second-hand, anyway, the machine is used, do not mind missing a heart out of the box Feeling, such as secondhand can save at least a memory or SSD money.

Well, calm thinking about this is the truth. The purpose of learning various techniques is not to save money. Well, now the senior cell phone Xiaobian for wisdom to tell everyone how to quickly detect the second cell phone.

To see whether a second-hand mobile phone is worth the seller’s price, in addition to checking the appearance of the mobile phone with a flashlight to see if there is a bump or scratch on the screen, the most important thing is whether the mobile phone has been repaired: The easiest way is to directly use the mobile phone brand website. Enter the phone IMEI code to check whether there is a maintenance record (do not know the IMEI code? Phone dialing interface * # 06 # ah).

OK, after the above verification, do not rush to "transaction successful" Oh. Now that the smart phone features are so hot, it is impossible to quickly find out what some “dark wounds” in some second-hand mobile phones can use. This time, we must use engineering mode to check certain major features.

To enter the smart phone's engineering mode, the above mentioned IMEI code is not the same as *#06#. Although Android phones use Android's underlying technology, but after adding various UIs (so-called OSs), manufacturers will also customize different codes for chip programs, Android versions, etc. used by their products. Simply put, you cannot use Huawei's engineering code to enter the engineering mode of Lenovo's mobile phone.

Alas, it is known that all brands of mobile phones have entered the engineering mode. Note: After entering the project mode, please do not click on the option. If the mobile phone has problems due to misoperation, Xiaobian is not responsible! ! !

360 mobile phone: *20121220#

HTC:*#*#3424#*#*

LG: 3485#* Phone Model #

Moto:*#*#372#*#*

OPPO:*#36446337#

Vivo:*#558#

ZUK:*#*#1111#*#*

Huawei: *#*#121314#*#*

Cool: *20060606#

LeTV: *#*#3646633#*#*

Lenovo: ####1111#

Meizu: *#*#3646633#*#*

Nubia: *#8604#

Samsung: *#0*#

Sony: *#*#7378423#*#*

Xiaomi: *#*#6484#*#* or *#*#64663#*#*

One plus: *#36446337#

ZTE: *983*3640#

(The above brands are listed in alphabetical order only, there is no other meaning, we do not have to find the trouble of Xiao Bian)

After entering the engineering mode, we only need to select the engineering test (different brands have different names). For example, vivo's mobile phones will put engineering tests together.

The OPPO divides the test items of each function into multiple items:

As long as you follow your personal needs, choose some of the functions that you will commonly use for simple testing, there is no big problem, even if this single sale is traded!

With such a set of procedures, how much can you strengthen your confidence in preparing for second-hand use?