The networks adjust your mobile bill every year according to the Retail Price Index (RPI) or Consumer Price Index (CPI) + rate of inflation.
Each year, your Pay Monthly airtime tariff will be adjusted according to the RPI+ (O2) or CPI+ (Three, Vodafone & Talkmobile) rate of inflation.
O2: The monthly price shown will increase each April by the RPI rate published in February of that year plus 3.9%.
Three: The monthly price shown will increase each April by the CPI rate published in January of that year plus 3.9%.
Vodafone: The monthly price shown plus all out-of-bundle charges will increase each April by the CPI rate published in January of that year plus 3.9%.
Talkmobile: The monthly price shown plus all out-of-bundle charges will increase each April by the CPI rate published in January of that year plus 3.9%.
What is the Retail Price Index?
It's a measure of inflation published monthly by the Office for National Statistics.
What is the Consumer Price Index?
It's a measure of inflation published monthly by the Office for National Statistics.