Wirelessly posted (iPhone 3G: Mozilla/5.0 (iPhone; U; CPU iPhone OS 3_0 like Mac OS X; en-us) AppleWebKit/528.18 (KHTML, like Gecko) Version/4.0 Mobile/7A341 Safari/528.16)
I'm fairly sure there's a Vodafone shop in arrivals. Either bring a cheap unlocked handset and buy a SIM or buy a prepay handset. Check www.vodafone.ie for prices.