Customers can text their tram number and a message up to 155 characters
A new service has been launched to allow Luas passengers report incidents of anti-social behaviour.
Customers can text the keyword 'LUAS' to 51444, giving the tram number and location and their message.
It can be up to 155 characters.
The tram's operator Transdev says within 90 seconds, the person will receive an automated reply to assure them Luas have received the text.
The Luas team will then review and action the message in accordance with protocols.
Transdev say standard text rates apply, meaning the customer pays in accordance with their service provider.
Anne Graham CEO of National Transport Authority, said: "Travelling by public transport and Luas in particular is a great way of getting around the city.
"However occasionally passengers encounter anti-social behaviour of one sort or another, and we want to make sure when that happens, people they have an easy and effective way of reporting it.
"This new service means that Luas staff can be made aware of these incidents and can respond to them quicker than ever, so that journeys can be even safer and more pleasant for everybody."
Dervla Brophy, communications manager at Transdev, added: "Luas is a safe, punctual and reliable tram service which Dublin has come to love, but we are always aiming to improve passenger satisfaction with the service".
"Passengers have mentioned that a simple, discreet way to inform Luas of people misbehaving would be a good idea.
"This pilot we hope will inform us about customer feelings and assist us with our response".
Some 90,000 passenger journeys are made on the Luas every day.