Smartphone Feature: There are some such things in the smartphone, which we see daily but do not know about them. In this list, there is a hole near the charging port of the smartphone. Perhaps you too would not know about the work of this hole, but at some point of time this question must have come in your mind that what is it for? You will be surprised to know that if this hole is not there then you will not be able to call. This hole looks very…
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