Well using a mobile phone except when contacting the signalman is against the rules. Given the various tones and buzzers which trigger in particular the cab signaling display the driver must be able to clearly hear them.
http://www.railusers.ie/passenger_in...plaints.php#ne
If Irish Rail don't seem to care,
http://www.rsc.ie and they will send someone out. Anytime we have contacted them they have taken direct and prompt action to stop what Irish Rail was or had planned to do