Carphone Warehouse added 3.169 million mobile customers in the second quarter of its financial year ended October 3, up two per cent on the same period last year.
The retailer also reported a two per cent increase in its customer base in the first six month of its financial year, which totaled 5.884 million.
Its Best Buy Europe joint venture opened 27 stores in the first half across its international base, taking its total to 2,236.
It said the demerger of its retail and TalkTalk telecoms businesses remains on track for the end of March 2010.
Meanwhile, its TalkTalk customer base increased by five per cent in the quarter to 2.93 million, an increased of 77,000 net new customers in the period, including AOL subscribers.
Carphone lost 62,000 net subscribers in Tiscali subscribers, in line with its expectations after the purchase of the broadband company.
Carphone Group chief executive Charles Dunstone said: “TalkTalk Group is continuing its growth momentum with TalkTalk’s value proposition and strong customer service clearly appealing to customers.
“[In regards to Tiscali], we anticipate the adjustment required will be a reduction of 160,000 customers, who are predominantly broadband customers. The consequential true up payment due to us will be made from funds currently held in escrow.
“We nevertheless remain confident that TalkTalk Group will end the current financial year with a total broadband base of between 4.1m and 4.2m customers and thus maintain the guidance we announced in June this year.
“In parallel, Best Buy Europe also performed well.
“We remain convinced that separating TalkTalk Group and Best Buy Europe will enable the worth and potential of each business to be more appropriately evaluated. We have made marked progress on a number of outstanding issues and we are increasingly confident of achieving the demerger by the end of March next year.”