The launch of 4G services has failed to prevent EE from reporting a fall in revenues for the first quarter of the year.
Turnover fell by 0.4 per cent in the three months to the end of March, compared with a rise of 1.5 per cent in the fourth quarter of 2012.
Service revenues stood at £1.422 billion for EE - a joint venture in the UK between France Telecom and Deutsche Telekom - in Q1 2013.
This figure still represents a strong performance from a company with a growing presence in the UK telecoms sector.
Meanwhile, EE has announced it has signed up almost 400,000 customers for 4G mobile services since the launch in October 2012.
For the last six months, the broadband provider has been rolling out super-fast mobile networks in towns and cities across the UK.
The firm is using spectrum in the 1,800MHz frequency band to offer next-generation mobile technology to consumers and business users, ahead of the wider 800MHz and 2.6GHz rollout.
Latest EE accounts show the firm had signed up 318,000 customers to 4G mobile services by the end of March 2013. According to the Guardian, 130,000 of these switched from other broadband providers.
Neal Milsom, Chief Financial Officer of EE, said the results were in line with the company's expectations.
"We are making good progress focusing on high value segments," he stated.
"We’re announcing 318,000 4G customers after just five months of trading, strong post-paid net adds and continued growth in our underlying average revenue per user."
Mr Milsom said the firm expects to strengthen its "industry leadership" position in the year ahead as the 4G rollout continues.
He claimed that the launch of double-speed 4GEE services should help attract new customers to EE's next-generation mobile platform.