The whole display is plastic, including the part on the front that doesn't wrap around. Yes the part behind the glass panel on the back would be protected, but the front of the phone wouldn't be.
replyYet they still make trifold phones where one of the folds is on the outer side...
reply"they" being Huawei, and their phone suffers from the same problem, the main display can be easily damaged by dust, dirt, or just your fingernails pressing into it. Notably Samsung's trifold kept the folding display entirely inside when folded, presumably to avoid this problem.
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