O2 has been named as the best mobile broadband provider for customer service, in a new Ofcom report.
The firm received just 0.02 complaints per 1,000 customers during the second quarter of 2011, the same number it recorded during the first three months of the year.
T-Mobile and Vodafone were the next best-performing dongle providers, with both firms registering 0.6 complaints per 1,000 subscribers.
Orange, the sister company of T-Mobile, received 0.7 complaints, while Three fared the worst with 0.14, having seen some customer dispute charges during Q2.
In terms of home broadband, Virgin Media performed best out of the four broadband providers studied, receiving 0.15 complaints per 1,000 customers.
Sky received 0.20 complaints per 1,000 subscribers, ahead of Orange (0.37) and BT (0.43).
But TalkTalk again fared the worst, with 0.58 complaints per 1,000 over its fixed broadband and 0.80 over its landline services.
However, this represented an improvement on the previous two quarters for the broadband and home phone provider.
Ofcom received 0.78 broadband complaints per 1,000 customers during the final three months of 2010, and 0.81 during Q1 2011.
Ernest Doku, technology expert at uSwitch.com, said: "Since Ofcom began compiling the data nearly a year ago, TalkTalk Group has stood out as the worst performer in both landline and fixed broadband services."
But while there is still more to be done, he noted that TalkTalk is "clearly pulling its socks up".
"In the second quarter of 2011 they received substantially fewer complaints than in the first quarter. These are positive steps."