EE and O2 also completed in the bottom three. Virtual community issuer Giffgaff got here top of the poll, beforehand of Utility Warehouse and Plusnet Mobile.
Which? Said the take a look at proved that correct “customer support” and “value for money” have been vital to humans.
Vodafone stated it become “sorry” that Which? Contributors have been sad with them.
In a statement, the organization delivered: “We are operating tough to apprehend the issue and what more we are able to do.”
In all, thirteen networks were protected within the survey of 6,135 Which? Participants in February.
The survey said Vodafone had accumulated one-superstar scores for customer support, the price for money and technical aid.
One in five of its clients informed Which? That “customer support, along with lawsuits handling and the way their queries had been treated, changed into bad”.
Only 27% of EE customers stated they had obtained desirable or superb carrier for technical help, even as one in 10 O2 customers rated the cost for cash they obtained as “bad”.
An EE spokeswoman stated: “We’re ranked pinnacle by OpenSignal for the mobile experience inside the UK, which is supported with the aid of different independent reports from Ofcom and RootMetrics.
“Ofcom’s ultra-modern figures additionally show that EE gets a number of the fewest proceedings inside the cell industry, as we’ve got continued to invest inside the UK’s satisfactory customer support.”
Nearly all Giffgaff clients stated it was “proper or splendid” for the cost for cash, adding they would advise it to friends and own family.
Sim-best offers proved on average 31% (£three.Fifty six a month) more expensive with the Big Four providers (EE, O2, Vodafone and Three).
The identical changed into proper for the common monthly agreement price for an iPhone XS, which was 18% extra (£10.Eleven) with the Big Four, whilst a Samsung Galaxy S10 becomes 6% greater high-priced (£3.22).
Natalie Hitchins, Which? Head of domestic products and services, said: “The persevering with the reign of smaller networks over the huge players is going to reveal precisely how vital customer support and value for money are to cell users.
“If you suspect you’re paying too much or are not getting the extent of provider you anticipate out of your issuer, you must shop around for a better deal – you would possibly find you save yourself a few money and in all likelihood a variety of grief, too.”