[andy]

I think you could find cheaper forward and callback options with an local SIM - for Ireland 9 or 10 eurocents a minute from Justvoip or Voipcheap, and scope for free int'l sms (for a year, then top up if you want) if you choose O2 Ireland and use a Java application I can tell you about.

Some British SIMs have free roaming in Ireland - 3 Like Home, or add-on options on others like O2 - plus the IoM or Jersey ones of course, and then JV and VC rates are 5 and 8 cents.

There is scope to get down to a cent or two with one of the UK and some other country SIMs, but this is rather elaborate, using other services as well, and waiting for 2 or 3p/min cashback for 3 months.

For regular travellers it's worth thinking about the Globalsim.de forwarded DID option that Przemolog posted about yesterday, and two other products launching in the next few weeks might merit a look to see if they match their hype