Daniel Hughes used his HTC One smartphone to make the world's highest ever video call from the top of Everest.
A smartphone has helped make history at the top of the world's tallest mountain.
British explorer Daniel Hughes used his HTC One to make the world's first video call from the top of Mount Everest, simultaneously making the world's highest ever call too.
Hughes, 32, aims to raise £1million for Comic Relief after placing a red nose on top of Everest. Standing 8,848m above sea level in temperatures below -35C, the climber spoke live to the BBC, using his smartphone powered by satellite technology.
He said: "This project has been two-and-a-half years in the making and it's hard to put into words how amazing and surreal it is to be speaking to London from the highest point in the world.
"The support for the expedition has been phenomenal and, thanks to the interactive nature of the climb, I really felt like I had everyone behind me."
Hughes allowed his supporters to follow every step of the journey through a constant stream of live updates, videos and pictures online.
Suzi Watson, spokesperson for HTC, one of the lead sponsors of the expedition, said: "We're truly proud to have been part of Daniel's amazing journey
"We pride ourselves on being at the forefront of design and innovation and the HTC One was put to the ultimate test in extreme conditions, where it was able to help Daniel connect to everyone back home - even from the top of the world."
Unveiled back in February, the HTC One is a 4G smartphone with a huge 4.7in display and one of the most powerful phone cameras money can buy. It runs the Android Jelly Bean operating system and has a top-end spec to rival the Samsung Galaxy S4.