Information security expert Colin Tancard warned that the use of public wireless Internet makes hackers of information on our devices easy to steal bank information and even money, according to Sky News.

Public Wi-Fi networks, such as those in coffee shops, hotels and airports, are a "pirate's paradise" where networks allow data thieves to access personal computers, such as a computer, tablet or mobile phone, and snoop on your private information. The hacker may be allowed to transfer funds from your bank account within seconds.

The expert warns that hackers use smart penetration equipment, including a device in the size of a pack of cigarettes known as "pineapples," launching fake waves of the same name as the Wi-Fi network used in the place, but can track anyone who tries to use them to access the Internet.

Among the data that pineapples can identify are contacts, e-mail passwords, bank credit card numbers, and so on.

Hackers can also use spyware on Wi-Fi networks to access hotel systems, make reservations, room details and stored credit card numbers for guests.