But O2 is close behind in new UK figures from the National Customer Satisfaction Index.
The mobile service industry as a whole scored 73 points, significantly better than the US average of 69 and equal to the national average for all goods and services in the UK.
The NCSI-UK is the sister initiative of the American Customer Satisfaction Index (ACSI), developed in conjunction with the University of Michigan.
In the UK, the measured companies are broadly representative of a significant proportion (over 50 per cent) of UK Household Expenditure as defined by the Office of National Statistics (ONS).
Of the UK operators Tesco Mobile has the highest satisfaction score of 82 points. Tied for second place are O2 (up three per cent from last year) and Virgin Mobile (up one per cent) with 77 points.
Orange is fourth overall with a score of 73, but has improved the most (up by six per cent) and is moving ahead of Vodafone, unchanged at 72. In last place is 3G provider 3.
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