Mobile phones specialist Carphone Warehouse has won 31,000 active and pending customers for its fixed-line service, talktalk, which was launched in February.
Early indications suggest the service, which is being marketed as offering big savings on BT rates, is generating monthly average revenue per user of£15.
New services, accessories and technological applications are increasingly important to Carphone, since so many people already own mobiles.
The retailer revealed the performance ahead of entering its closed period, and said that trading across the group since January's update is in line with expectations.
Carphone bosses are confident of delivering sustainable growth and the retailer will pay a maiden dividend of 1p 'in light of the group's financial strength and prospects'.