Today marks 20 years since the first text message was sent to a mobile phone.
The first ever text was sent on December 3 1992, when Neil Papworth, a 22-year-old British engineer used his computer to send the message "Merry Christmas" to an Orbitel 901 mobile phone.
According to research by Ofcom, the media regulator, the average UK consumer now sends around 50 text messages every week.
In 2011, more than 150 billion text messages were sent in the UK, which was almost triple the amount sent five years previously in 2006 - when 51 billion texts were sent, according to an Ofcom report.
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Andreea Cristea, 29, remains in a critical condition after being rescued from the Thames after a terror attack along Westminster Bridge.
The Prime Minister has praised the former soldier's "huge professionalism" in trying to save the life of Pc Keith Palmer.
The man who carried out the Westminster attack is thought to be British born and was once investigated by MI5, the Prime Minister has said.