I use quios.com - they're always very fast - msgs usually delivered within seconds, and I've never missed a message. The (free) registration gives you extra facilities.
MTN I've never found to be particularly reliable or speedy.
-usual disclaimer - I've no commercial involvement with Quios, and the msg delivery is for Esat, can't speak for Eircom.
#Or, try and use one of those free websites, like mtn, this is in the
#somewhere (good luck ;)
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