If you find the phone number listed on FAFB is not working, are you remembering to add the country code?
Here are some examples:
If you are calling or texting Ireland from the UK you need to add +353 in front of the number.
If you are calling or texting the UK from Ireland you need to add +44 in front of the number.
If you are adding a country code and there is a 0 at the start of the number you will have to omit that.
Please read these instructions on using your phone to make a call outside your own country before you decide the number is wrong.