The man who sent the first ever text message says he had no idea at the time how significant the development was.
It's 25 years since Neil Papworth's SMS to a Vodafone colleague - it simply said 'Merry Christmas.'
It was typed on a computer, because originally mobiles could only receive messages.
Neil says no-one knew how popular it would become.
The S-M-S contained no abbreviations, and certainly no emojis.
Elizabeth Bruton from London's Science Museum says it's a hugely significant development.
The man who sent the first ever text message says he had no idea at the time how significant the development was.
