This is its front view. Let's take a look at the front view of Meizu mx3.

Through simple observation, it is found that the sensor with only the receiver position is somewhat different (just from the picture).

Let's take a look at the back photo of Meizu mx4.

Meizu mx3 back photo

Through observation, only the back of mx3 has stereo, while the stereo of mx4 is at the bottom of the phone.

Then look at their bottom photos. This is mx4.

This is the bottom photo of mx3.

It can be seen that the charging interface and the microphone are similar in location, and everything else is different.

This is the comparison between mx4 and mx3 mobile phones, with mx3 on the left and mx4 on the right. Obviously, mx4 is much bigger than mx3.

I hope my answer is helpful to you!