Melissa Thompson, 27, was shopping with her boyfriend when they stopped at a Samsung roadshow and she was invited to make an attempt at breaking the world record.
'She said she used to send a lot of text messages, including 40 or 50-a-day to her boyfriend, Chris Davies, so she knew she was fast.
''But since we moved in together and I started my job I haven't been texting as much and, you could say, my fingers were out of shape,” she told The Telegraph
''It's a real shock to find out that I'm the fastest texter in the world.
Thompson, who is from Salford, Greater Manchester, wrote ''the razor-toothed piranhas of the genera Serrasalmus and Pygocentrus are the most ferocious freshwater fish in the world. In reality they seldom attack a human'', in 25.94 seconds.
The fastest recorded time before this, which is an official Guinness World Record, was 35.54 seconds. It was set in March by Franklin Page, a 24-year-old American.
Thompson was using Samsung's new Galaxy S smartphone, with the ‘Swype’ keypad, to tap in the message, and she said the phone made it easy. It allows users to text without their fingertip leaving the screen.
The Guinness Book of World Records will now assess Thompson’s record.