I'm on 02 pay as you go in Ireland. €20 for 30 days, no contract and top up when I feel like it.
The one thing I dislike is that the 02 homepage keeps hijacking the browser at irregular intervals when I click one of my bookmarks or try to visit any other site. This is most annoying and I can't see a way to prevent it. Has anyone else had this issue? It will probably drive me to Vodafone when my current 30 days is used up.