This tutorial will take a real iPhoneSE and a fake iPhoneSE (modified from iPhone5s) as an example.
Method one: Using SEID to verify.

From the picture above, you can see two iPhoneSEs, the Apple iPhoneSE China Version and iPhoneSE U.S. Version. After checking the two iPhone’s IMEI numbers, the result shows that the two devices are under warranty date and each of them is iPhoneSE.

And then, please respectively open the “Settings” of the two iPhone→click the button ”General”→click the button ”About”, then you will see some detailed parameters about the device. The big difference between iPhone5s and iPhoneSE is that the legitimate iPhoneSE has an item “SEID” under the item “Modem Firmware”. However, the iPhone5s doesn’t have the item “SEID” because it can’t be added to iPhone5s. So, you can identity a real iPhoneSE according to the item “SEID”.
Method Two: Using front-facing flashlight and live photo to verify.

You know there are no big differences except the 3D Touch between iPhoneSE and iPhone6s. In addition, iPhone6s is also equipped with Live Photo and front-facing flashlight. iPhoneSE that is modified from iPhone5s can’t reach that . Live photo refers to photos with sound. You can check the photos by pressing the screen. iPhoneSE that is modified from iPhone5s can’t do that because its screen doesn’t support force touch.

Another big improvement on iPhone6 is that while a user is using the front-facing camera to take photos in the dark situation, the flashlight will automatically fill light for the user. But the iPhoneSE that is modified from iPhone5s can’t do that. You can see the differences from the following picture.

From the picture above, we can obviously find that a real iPhoneSE has its specialized feature -filling light, especially in the dark places. In contrast, iPhoneSE that is modified from iPhone5s doesn’t have this feature.
Warm prompt: Many people are seeking cheap psychological, unwilling to pay the cost of the genuine iPhone, the results have been deceived and lose. You are suggested to purchase iPhone from Apple retail stores. If you want to buy a second hand iPhone, you should find a formal retail store. Only in this way can you protect your best interests.