Hello Eleanor, to block a landline number the prefix is 141, to block a mobile number it is hash31hash followed by the mobile number you are calling. Bert ----- Original Message ----- From: Eleanor Burke To: vip_students@xxxxxxxxxxxxx Sent: Friday, July 23, 2010 1:04 PM Subject: [vip_students] Mobile Corner Hi All In the UK when I use my landline or mobile phone, I can prefix the number with the digits 141 to withhold my caller ID. Is there anything similar here in Ireland? I have tried this 141 prefix but it did not work here. Eleanor