Samsung has unveiled two new flagship smartphones at Mobile World Congress in Barcelona. The company claims the Galaxy S6 and S6 Edge are the most advanced smartphones in the world. 

The manufacturer is hoping to reclaim some of the ground it has lost to Apple's iPhone in recent months with the new handsets. Both include a built in battery for the first time in a Samsung flagship phone, which can also be charged wirelessly.

The handsets are made with a combination of metal and Gorilla Glass, giving them an up-market feel more in line with rivals like Apple's iPhone 6 and HTC's new One M9.

The new phones have improved cameras front and back, and better battery life with Samsung claiming that a 10 minute charge adds four hours usage time to the phone. The 5.1 inch quad HD super AMOLED screen has 77% more pixels than before and it is all driven by a 64 bit processor which Samsung says is the fastest on the market.

The new Galaxy S6 Edge carries many of the same features as the S6, but also has curved edges on both sides. These can be used for certain functions, like alerting the user to which person has called or emailed them.

The new S6 family will be released from April 10 in 20 countries in 32, 64, and 128GB options.

Samsung also announced that it is to take on Apple in the mobile payments market, by launching its own system Samsung Pay. 

The system, which will be supported by MasterCard and Visa and a range of banks, will start this summer in the US and Korea and will be accepted by more merchants than any other, according to Samsung. 

It will work with debit cards, credit cards and Near Field Communication (NFC) technology.

The company also announced that it is to release a new version of its Gear VR virtual reality headset.