Wi-Fi hotspot in some of the public places like airports, hotels, libraries, coffee shops and other public places are useful, but most of the time they are not secure enough. If you connect to such Wi-Fi network and send messages via website or mobile apps then it might be accessed by someone else. So you have to be very creful while using Wi-Fi network at public places because it nmay harm you very badly if you don't take this issue very seriously.
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