The first-ever SMS text message simply said 'Merry Christmas'.
Why it is true
Sent on December 3, 1992, by engineer Neil Papworth to colleague Richard Jarvis, it was sent from a computer to a mobile phone because phones didn't have keypads yet.
Source: Technology History
Would you rather be asked first?
This is the reading side of the site, so the answer is in the sentence above — that is the whole point of it. Test yourself works the other way round: the question comes on its own, and the fact and the explanation only appear once you have answered.