Vodafone Ireland increased its customer case by 39,000 to 1.93 million in the last three months of 2004.
In a statement today the company said Average revenue per user (ARPU) in Ireland increased to €602 from €596.
This compares with €303 in Germany, €459 in the Netherlands and £314 sterling in Britain.
ARPU for pre-pay customers increased to €370 from €366 while post-pay ARPU also rose to €1,186 from €1,170 during the period.
Strategy Director Mr Gerry Fahy: "It is clear that competitive pressures have never been as intense in the Irish marketplace as they are now.
Mr Fahey said: "We have called on ComReg to change its position on wholesale access and origination and unless it does so, we will use every avenue open to us to appeal the decision."
The Vodafone Group as a whole added 5.4 million more customers over the final quarter exceeding expectations.
Vodafone, the world's largest mobile phone company by revenue, said today its global subscriber base had risen to 151.8 million after its strongest quarter of new customer additions since December 2000 on the back of aggressive marketing.
Robust customer growth in markets such as Germany, Italy, Spain and Britain offset another poor performance in Vodafone's struggling Japanese business, which added only 36,000 net new subscribers, about 40 per cent less than in the previous quarter.
Analysts had forecast net customer growth of about 3.9-4.5 million. But that growth comes at a cost. As expected, average revenue per user (ARPU) - a key profitability measure for the industry - was flat in Italy and fell in increasingly competitive markets such as Germany, the UK and in Japan, where Vodafone is battling to keep higher-spending customers.