I have been using both telestunt & tele2 or vartec as telestunt is cheap for day calls and tele2 for evening & weekend calls.but now I have stated using skype since last 3mths..which is comparitavely very cheap and costs only euro 0,160 for ireland -mobile and euro 0,017 for ireland -dublin…and the cost remains same for everyday of the week -morning or evening..( website http://www.skype .com )