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Originally Posted by surfer
Why does wifi sd and mini sd always stick out 
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Because if your phone has built-in Wi-Fi then it has
built-in antenna for the Wi-Fi but if it has Wi-Fi on the card then it doesn't have such antenna and the protruding part of the Wi-Fi card (that "sticks out") serves as the antenna. I reckon that technically it would be possible cards that don't stick out but reception of such cards would be extremely poor (think of putting your phone into metal box and trying to receive Wi-Fi signal in it)...