With the rise of iPhone and Android phones, the functions of smart phones are changing with each passing day, especially the development of Android phones is quite rapid. 2K level screens, eight core processors, 3G capacity Ram and various high specification parameters emerge in endlessly. However, due to the relative unity of the supply chain and the limitation of technological development, it is difficult for manufacturers to open a gap with their rivals in terms of configuration, so many mobile phones attach innovation to the back of mobile phones.

In the past, there was only one camera and the matching fill light on the back of common mobile phones, and some mobile phones also added speakers on the back. Since touch screen mobile phones are usually a large screen on the front, it is difficult to add too many functions, so major manufacturers have also shifted their goals to the back of mobile phones. We also found that the back functions of mobile phones have become more and more diverse in recent years:

Samsung Galaxy S5

As the current mobile king of Android, many users are disappointed that the Galaxy S5 does not use the 2K screen and 3G Ram. However, the Galaxy S5 has also added the design of fingerprint recognition, waterproof and dustproof, heart rate detection and other special functions. The heart rate detection sensor is placed under the camera, and the shape of the led fill light of the Galaxy S5 is particularly exaggerated. When users use the heart rate detection function, they just need to place their fingers at the position of the sensor, and it will turn on the red light, and detect the user's heart rate or "pressure index".

HTC One（M8）

M8 is also a star product in Android phones. 90% of its metal body and comfortable body radian give it a super first-class feel. The M8 also has a "unique skill" on its back. It innovatively adds a "depth of field camera", which is used to assist the main camera. When two cameras work together, you can take photos first and then focus, adjust the depth of field and other interesting photography functions.

LG G2

G2's fuselage design subverts the general Android phone's fuselage layout, and no buttons can be found on the front and side of its fuselage. LG claims that in order to ensure the same use experience for both left and right hands, the on key and volume key are placed on the back of the body, so that users can use the keys on the back more naturally when holding the phone. Of course, this design will also bring some problems. For example, the user needs to use the On key with the volume - two keys with the screen capture will feel a bit awkward.

LG G3

In addition to the previous G2 back button design, G3 also adds a sensor on the left side of the camera. This is a laser sensor, which can achieve faster focusing speed. (Figure via: Phonearena）

Fantai Vega LTE-A

Fantai's Vega LTE-A (A880) also has a complex design in the camera part, adding a fingerprint identification sensor under the led fill light. In addition to realizing fingerprint identification function, it is also a touch pad, which can realize sliding, clicking and other operations.

vivo Xplay3S

Similar to the Vega LTE-A of Fantai, the Xplay3S also adds a fingerprint identification sensor under the led fill light, which can realize fingerprint unlocking, application encryption and other functions.

OPPO N1

In addition to the most distinctive rotating camera, N1 also innovatively adds a touch pad on the back, which can be used to turn pages, quickly start the camera and other functions, which also solves the problem that large screen mobile phones are difficult to operate with one hand to a certain extent.

Having seen the various back functions of the above mobile phones, which one do you think is the most practical?