Solved! Why big smartphone chins, but no buttons?

Fluen_

Prominent
Jun 10, 2017
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So I noticed, that my friend Huawei device has a gigantic chin, but no buttons.
I compared his phone with my Samsung j5 2017, which has buttons, and his actually had a bigger chin.

What is the reason that they have such a big chin, but no physical buttons?
DAM203925775-0-f326e942-7c0b-4b15-ab04-a9d2085e8a48.jpg
 
Solution
There may be touch buttons there, or that is just how they designed it, could be to use a certain screen size, could be to keep the size to hold the electronics.