Three customers had to make the most complaints, while Vodafone, EE and Tesco Mobile customers made the least, latest figures show.
New quarterly figures from the telecoms watchdog have revealed the companies faring the best and worst in terms of customer complaints.
Vodafone, Tesco Mobile and EE all generated the lowest number of official gripes, while Three finished bottom of the pile.
According to Ofcom, Three's most common complaints related to service issues (31%), poor complaints handling (21%) and billing problems (20%).
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Total complaint figures far higher
The graphic from Ofcom below highlights how all the major networks compare and covers the three months between April and June 2025, which are the latest figures available.
It's worth pointing out that, while the number of complaints appears low for all mobile providers, these are issues that customers have needed to escalate to Ofcom as they've been unable to resolve their issues directly with their provider.
The actual number of complaints made directly to network providers is far higher: Ofcom's data suggests that around one in eight (12%) mobile customers said they had a reason to complain over the last 12-month period.
Best & worst mobile firms: complaints per 100,000 customers
Source: Ofcom
As mentioned earlier, Tesco Mobile, Vodafone and EE all shared top spot after both generated just one official complaint per 100,000 customers.
There was also a three-way tie for second between O2, iD Mobile and Sky, with all responsible for a total of two complaints per 100,000 customers each.
At the bottom of the table, Three was responsible for three complaints per 100,000.
It marks the first time in 21 months that someone other than O2 has finished last.
Which providers offer consistently good service?
Ofcom publishes data on the number of complaints it receives about each of the big telecoms providers every three months.
Looking at such a short period can be unreliable – any provider can have a temporary problem that dramatically skews the figures.
In order to give you a clearer picture of how the mobile network giants consistently fare, we've listed the complaints figures for the last six quarters (18 months) in the table below.
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Complaints per 100,000 customers over the last 18 months
|
Provider |
Q1 2024 |
Q2 2024 |
Q3 2024 |
Q4 2024 |
Q1 2025 |
Q2 2025 |
|
Vodafone |
2 |
2 |
2 |
3 |
1 |
1 |
|
iD Mobile |
4 |
3 |
2 |
3 |
2 |
2 |
|
Three |
4 |
3 |
3 |
3 |
2 |
3 |
|
O2 |
8 |
8 |
5 |
4 |
3 |
2 |
|
EE |
2 |
2 |
2 |
2 |
2 |
1 |
|
2 |
2 |
1 |
1 |
2 |
2 |
|
|
Tesco Mobile |
1 |
1 |
1 |
1 |
1 |
1 |
|
Industry average |
4 |
3 |
3 |
2 |
2 |
2 |
Mobile coverage
Practically speaking, the most important thing to keep in mind when signing up for any phone contract is the coverage and reception offered by the operator (you can read about the best networks for signal and speed here).
Ultimately, an extremely helpful call centre is of little use if you can't even phone them in the first place!
To make sure you don't live in a particular network's 'blackspot', the links below will take you to each network’s coverage map or coverage checker, so you can get a decent idea of the coverage you can expect where you live.
Finally, find out which other telecoms providers you should be dodging by reading our regularly updated roundups of The UK’s worst pay TV providers, The UK's worst home phone providers and The UK’s worst broadband providers.
If you're fed up with your provider or simply need a new phone, why not compare deals with Uswitch? (note: we may receive a small commission for any purchase you make, but it won't affect the price you pay)
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