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With the rise of online shopping, more and more users will choose to buy mobile phones online. In particular, the prices of mobile phones such as JD and Taobao are really attractive to ordinary users. However, the biggest problem of buying mobile phones online is that you can't make payment after knowing the machine first as in traditional stores. How should users test mobile phones after they get the machine sent by express? The same problem will also occur when buying smuggled goods in physical stores. Because many smuggled goods are "out of the box and unrecognized", ordinary consumers really need a pair of hot eyes to ensure that they are not trapped. The inspection of the appearance is not explained much. The main attention is to check whether the screen has scratches, dust, and whether the battery contacts and USB cables have been used. This article focuses on some functional inspection machines.

Demonstration environment: Galaxy Note II

When you get the machine, of course, the first thing is to check "two yards", Enter "* # 06 #" on the dial panel Check to see if the IMEI code in the phone and the IMEI code on the back of the phone are correct. Of course, many mobile phones have IMEI in some relatively hidden places, such as the iPhone's on the card slot. of course, If it is a mobile phone, you should check whether the "three sizes" are in one, and also check whether the IMEI on the box is correct 。

Then immediately enter the engineering mode. Of course, not all machines will have the engineering mode. Here is the Galaxy Note II. The code of the project mode is to enter "* # 0 * #" on the dial panel.

Here are some engineering models of mainstream mobile phones for reference:

Samsung: * # 0 * # (not applicable to "Prince" Nexus series)

HTC：*#*#4636#*#*

Sony: * # * # 7378423#*#*

LG: 3845 # * 880 #

After entering the engineering mode, it was immediately "enlightened". I believe that these English words are not difficult for readers, so let's talk about them briefly (based on Samsung, other brands are similar).

Bad spot and color test (please open the "writing wheel eye"!), Samsung only has red, green and blue, which is not scientific（ Black and white is the key ）。

Rear camera test.

Sensor testing (gravity sensing, distance sensing, light sensing, gyroscope, etc.).

Put your hand on the distance sensor where the whole picture will turn green.

Touch screen test.

Front camera test.

Microcontroller test.

Screen refresh rate test.

Of course, some necessary functions that are not available in the engineering mode should also be tested, such as WLAN、 Bluetooth Etc.

The NFC test method is very simple, Just take the bus card to the back of the machine and "brush" it. If there is a noise, it means that the NFC is normal 。

Of course, you also need to try the call function (you can also try the headset).

Here are two software tests（ Google Market Download ）, multi touch first MultiTouch Tester 。

Professional screen test software Display Tester 。

Finally, try the accessories, Especially charger The author once tried to connect the charger when buying the machine and it showed that the charger was charging, but in fact the charger of the machine had broken! Be sure to see that the power will increase when charging , which means the function is normal.

Some readers may ask, if I am not Android or my phone has no engineering mode at all, how can I break it? In fact, the engineering mode is not mysterious, Just follow its routine and run the "process" once in the actual function. As for the multi touch test, it is completely possible to install a fruit ninja instead. The screen test can be replaced by some solid color pictures, high-definition landscape pictures, etc. on the Internet. Of course, it depends on people's character in the end, so it is the king's way to accumulate RP by doing more good deeds at ordinary times!

Learn more about new cool devices, stay tuned