Nowadays, smartphones are popular and indispensable items for many people. This is the basic device to connect many daily essential activities such as checking email, chatting online, reading news, looking for information, shopping, even ordering food, drinks, or goods, etc.
On the other hand, there are many issues that users have met on internet such as receiving advertising messages about English courses when they have children at school age, real estate advertising, inviting to use free beauty care services, beauty salons. Some online shopping apps continuously suggest items that the users had searched online. Even just using the internet at a restaurant, bar, or public place, a moment later, questions will be appeared on your phone about how to rate the place.
With social media such as Facebook, Instagram, Twitter and apps, users accidentally reveal their personal information about ID, home address, mobile phone number, and others.
On the above samples, users have accidentally made traces for hackers to access.
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