Telecoms regulator Ofcom has revealed the most complained-about mobile networks in the UK. Ofcom published the figures on Thursday (19 February), showing that while mobile operators generally attract far fewer complaints than fixed broadband or landline providers, some still stand out for customer dissatisfaction.
Top Mobile Networks for Complaints (Q3 2025)
- O2 and Sky Mobile led the rankings, with many issues linked to poor complaints handling processes.
- Three followed closely, where customers primarily reported problems with faults, service quality, and getting connected (provisioning issues).
By comparison, EE, Tesco Mobile, Vodafone, and iD Mobile recorded the fewest complaints, making them the strongest performers for customer satisfaction in the mobile sector during this period.
Ofcom’s data highlights persistent challenges in complaints handling and switching providers for some networks, even as mobile services generally see lower dissatisfaction than fixed-line options.
The regulator tracks complaints received directly from consumers about major providers (those with over 1.5% market share) and normalises them per 100,000 subscribers for fair comparisons.
The industry average for mobile complaints remains low at around 2 per 100,000 customers, reflecting generally better performance in the mobile sector compared to fixed services.
Ongoing issues
The report highlights ongoing challenges in customer service and switching processes across parts of the industry, even as overall telecoms complaints trends show some improvement year-on-year in certain categories.
Ofcom receives complaints directly from consumers about major providers (those with over 1.5% market share) and publishes these quarterly rankings based on complaints per 100,000 subscribers to allow fair comparisons.
Mobile complaints tend to be lower volume overall, but the data serves as a key indicator for providers to address pain points like billing, faults, and support responsiveness.
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