Tesco Mobile was the least complained-about network between October and December 2017, according to data released by Ofcom.
It is the 15th consecutive quarter that the joint venture between supermarket giant Tesco and O2 garnered the least complaints, with just one per 100,000 customers.
EE, Three and O2 all had just three complaints per 100,000.
At the other end of the scale, BT and Vodafone were the most complained about mobile networks over the period.
The regulator says that the two networks generated the highest volume of complaints among pay monthly customers, with 11 per 100,000 subscribers registering their displeasure.
Most complaints were driven by issues around handling, billing, pricing and charges.
Virgin Mobile and TalkTalk were also above the industry average of five complaints per 100,000 subscribers, with 10 and seven respectively.
Tesco Mobile’s Chief Marketing Officer Simon Groves said: “We are extremely pleased to have again been named by Ofcom as the least complained about mobile network for the fifteenth consecutive quarter.
“We want to be the mobile customer champion in everything we do and this represents another great endorsement of the work that our store and customer service colleagues are doing to set us apart as a network.”