The three apps are free to download and the companies say they are focusing on attracting new users rather than making profits at this early stage. Line's strongest markets are in Indonesia, Japan, Taiwan and Thailand but the app also has 10 million users in Spain.And the revenues are starting to flow, through sales of "stickers" – stylized icons for user profiles – and add-ons for free games.

Free mobile teen cyber chat-53

( Why most mobile apps can't be trusted) With a population of 600 million people, a burgeoning middle class and fast-rising smartphone sales, southeast Asia has become the front line in a battle for mobile phone users that is threatening the traditional dominance of mobile phone network operators, global internet companies such as Facebook and Google and now-struggling handset maker Black Berry.

Like their western rivals, Kakao Talk, Line and We Chat allow users to send free messages through mobile internet connections but their playful, teen-friendly style has set them apart, driving them to the top of many app download charts.

Nguyen Tung Lam, a 16-year-old high school student in Hanoi, uses Japanese mobile messaging service Line to chat with his girlfriend because she "likes the cute icons such as the teddy bear and bunny".

Doan Nguyen Trang, another Vietnamese teenager, prefers South Korea's Kakao Talk app because it is promoted by a wildly popular Korean boy band.

The best control you have (besides taking the phone away) is to just have a frank heart-to-heart about how there is no such thing as texts or photos that disappear and this is some down-and-dirty stuff that can come back to haunt them.

Like Snapchat, Burn Note is a messaging app that erases messages after a set period of time.

That way, whenever a new app is downloaded by the teen, it will automatically download to the parent's phone as well. Last fall, there was a headline-making case in a Colorado high school where teens used apps to hide a huge sexting ring from parents and school officials.

And an Alabama district attorney, Pamela Casey, posted the video below to warn parents about the Calculator% app.

Sales of smartphones in southeast Asia have surged in the past few years because of rising incomes and the advent of cheaper, often Chinese-made phones that sell for as little as .