1) On the screen:

E5 and 53 are both 26, color TFT displays with a resolution of 32× 24 and 2. inches, and the display effect is good.

668 is a little behind in resolution, but the color is still maintained at 26W. The graininess is also a bit obvious.

2) Camera: four models are 1.3 million pixels (668 has a front camera, but 6681 doesn't)

3) Music performance: 53 is a semi-professional music player. Although it can only be a low-end music phone, at least it is better among the four models in listening to music.

4) Practicality: Software expansion is much worse. Others are smart phones. But 323 is an older generation of smart phones, and the response speed is really flattering .. It's very poor. Both 668 and E5 have fast response speeds. Because E5 is an E-series business phone, it is a little better than 668.

5) Mobile phone quality:

53 is the worst. The slider is extremely poor. It basically fails in quality.

The p>325 and 668 are relatively experienced in ups and downs, and the straight design has no shortcomings.

The quality of E5 is the highest among the four models, and the quality reputation of E-series business machines has always been very good.

Overall, the 668 and E5 are the best among the four models.