Ofcom has released its complaints data for Q2, 2012, revealing which operators customers complained about most during the period. It also showed that complaints from customers on pay-monthly contracts are much more common than those on pay-as-you-go, making up 95 per cent of all complaints received.

And the most complained-about operator is Three, generating 0.19 complaints per 1,000 customers, mainly over charge disputes and issues with customer service. O2, meanwhile, was the least complained about mobile provider, with 0.05 complaints per 1,000 customers.

“We’re pleased with the results from Ofcom’s research on the number of complaints from O2 customers,” said an O2 spokesperson. “We’ve remained in the number one position for seven consecutive quarters and we’ll continue to work hard to deliver the best possible experience for our customers.”

The industry standard is 0.13 complaints per 1000 customers – O2 was the only network operator that came in under this average, along with MVNO Virgin Mobile.