Phone rental counters at Dublin Airport rent 900 MHz GSM phones which will take any North American PCS SIM card. Check to ensure that the North American PCS network has a roaming agreement with one of the Irish GSM networks. Subscribers SIM card and phone number retained while roaming. Subscribers SIM card and phone number retained while roaming. These messages are displayed like paging messages on the display of your mobile phone.
Incoming messages are free.
No modem is required because the networks are entirely digital. Analog cellular phones such as those used in the USA are not compatible with the Irish networks. USA Dual mode digital GSM phones which support 900MHz GSM will work in Ireland. Be sure you have a SIM card from a network that has a roaming agreement with an Irish network. See the GSM World site for information on North American digital mobile networks using the GSM standard.